Abstract
Nonlinear adjustments of consumption to housing prices, stock prices, income, and interest rates were investigated by employing panel data from 25 countries, spanning the period 2000 to 2016. This is the first study which STAR family models and nonlinear impulse response functions based on the local projections employed alternatively. We present three main pieces of evidence: (1) housing prices, stock prices, interest rates, and income exposures of consumption show time-varying and asymmetric behaviours across all countries, (2) housing wealth effects show stronger persistency and are generally larger than financial wealth effects in most of the countries, and (3) time-varying housing and financial wealth effects are high (low) during expansionary (recessionary) periods across all countries. We suggest to consider both monetary and fiscal policies, as well as the asymmetric and time-varying nature of house prices, stock prices, income, and interest rates on the top of any potential impact of the level of transition in these variables.
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1 Introduction
The permanent income theory (Friedman 1957) and the life cycle model (Ando and Modigliani 1963), respectively, suggest that consumption is determined by future income expectations while being smoothed by the life cycle effect. Consumers’ response to income and wealth shocks results in variations in consumption (Boone et al. 2002). Specifically, in the last two decades, the world economy experienced a large-scale cyclicality due to unending bubble–post-bubble environment, including the dot-com bubble (2000–2003), the global financial crisis (GFC) (2007–2010), and possibly the Covid-19 period. It seems that households do not change of their consumption habits immediately in these episodes. However, several macroeconomic and psychological factors may affect consumption in this highly volatile economic environment. Therefore, intuitively, it is not surprising to expect some cyclical and nonlinear (i.e. asymmetric and/or time varying) behaviours in consumption and its components (Elliot 1980). However, the empirical literature reveals that wealth effects are mostly analysed through linear models with some rare exceptions (i.e. see Simo-Kengne et al. 2013; Jawadi and Sousa 2014; Hviid and Kuchler 2017; Berger et al. 2017; Jawadi et al. 2017). Moreover, despite a better articulation of the presence of wealth effect, the time-varying and asymmetric relationship that may exist between house prices, stock prices, income, interest rates, and consumption has not received much scholarly attention. From a policy-making perspective, ignoring possible influences of state dependency and asymmetry in linear modelling may probably prepare a ground for possible mistakes in consumption-related economic policies (Tsai et al. 2011; Jawadi and Leoni 2012).
In addition to this critical modelling gap, the emerging asymmetric and time-varying wealth effect literature mainly focuses on house and stock price asymmetries and the impact of the remaining consumption-related variables has been generally less investigated. However, rising income and wealth inequalities, declining real interest rates (Del Negro et al. 2019), and injecting helicopter drops all over the world during post-GFC and Covid-19 periods imply that the shocks on marginal propensity to consume out of income and interest rate may also play an important role in the transmission of economic policies (i.e. see Donihue and Avramenko 2007; MacDonald et al. 2011; Simo-Kengne et al. 2013; Bunn et al. 2018). This observation suggests that a more holistic approach with an expanded variable set and sample in wealth effects studies may improve our understanding.
Motivated by the above-mentioned concerns, this paper aims to address certain gaps in the empirical literature. We examine nonlinear adjustments of consumption to housing wealth, financial wealth, interest rates, and income for the panel data of 25—mostly OECD—countries during the period of 2000 and 2016 by employing logistic smooth transition autoregressive (LSTAR), exponential STAR (ESTAR), and smooth transition autoregressive with exogenous transition (STARX) modelling approaches and nonlinear impulse response functions based on local projections.
This study differs from previous empirical studies in three main respects. First, to the best of our knowledge, there has been no investigation of the impact of housing wealth, financial wealth, interest rates, and income on consumption that allows the analysis of state dependency and asymmetry during expansionary and recessive periods for 25 countries in nonlinear modelling through simultaneously employing STAR family models and impulse response functions. In the light of modelling and evidence sets, first, we argue that a nonlinear modelling framework better explains the impact of a wide range of heterogeneity in housing and financial wealth effects. Second, we provide evidence that on the top of income and interest rates, housing and stock prices exposures to consumption generally show a persistent, asymmetric, and time-varying behaviour. For the latter nonlinear effect, we also generally report semi-strong or weak transitions from one regime to another. This evidence, with extensive country-level evidence set, gives a generalization opportunity for the time-varying and asymmetric wealth effect and consumption literature. Third, we attempt to classify panel countries based on various country-specific evidence and their financial and housing market characteristics. This classification helps to develop a more sophisticated policy tool for policymakers aiming to adopt a cyclical housing and financial wealth effect, income, and interest rates policies during different market regimes.
The remainder of the paper is organized as follows. Section 2 reviews the literature. Section 3 outlines the data and the modelling strategy. Empirical results are presented in Sect. 4, while discussion and policy suggestions are offered in Sect. 5. Finally, Sect. 6 concludes. Additionally, Appendix 1, Appendix 2, and Appendix 3, respectively, present the total coefficients, classification of countries based on their transition speeds, and selected economic and financial characteristics.
2 Literature review
2.1 Asymmetric responses of consumption to housing and financial wealth shocks
The large body of findings reveals that housing wealth is generally found to have a stronger effect than the financial wealth on consumption (i.e. see Benjamin et al. 2004; Sousa 2005; Bostic et al. 2009; Case et al. 2013). Despite some counter-evidence (i.e. see Sousa 2005; Donihue and Avramenko 2007), empirical studies also generally suggest that the housing and financial wealth effects may show cyclical and asymmetric behaviour across countries, as well as across different market regimes (i.e. see Romer 1990; Lettau and Ludvigson 2004).
The asymmetric behaviour of consumption would be related to several factors such as concave consumption function produced by income uncertainty and risk aversion (Carroll and Kimball 1996), loss aversion (Shirvani and Wilbratte 2000), imperfect capital markets (Patterson 1993), varying perceptions of liquidity (Shefrin and Thaler 1988), and the combination of liquidity constrains and business cycles (i.e. see Apergis and Miller 2006). Unequal or asymmetric responses of consumption to changes in prices may have different features in the housing market due to its different nature vis-à-vis non-financial assets. For example, Case et al. (2005; 2011) indicate that reductions in housing prices and wealth may not lead to significant declines (or may result in only marginal decline) in households’ consumption. Moreover, the literature reveals that perceived less volatility (Catte et al. 2004), rather evenly distribution of wealth (Catte et al. 2004; Mishkin 2007), downward stickiness of prices (Case and Quigley 2008; Tsai et al. 2011), and consumption insurance function (Bostic et al. 2009) in housing may result in different consumption and nonlinear adjustment patterns in housing wealth.
The magnitude of housing and financial wealth effects shows variations across countries depending on various features. For example, the empirical results suggest that market-based Anglo-Saxon economies may have strong wealth effects (i.e. Slacalek 2009; Albacete and Lindner 2017). Despite complexities, the emerging literature suggests that the level of market completeness and market characteristics may also play roles in the wealth effect variations (i.e. see Li and Yao 2007). From the housing market perspective, depending also on the effect of leverage, house price appreciation may play a critical role in strengthening the housing wealth effect. However, as observed during and afterwards the subprime mortgage crisis period, deleveraging may also result in significant drawbacks.
On top of certain rational dynamics, psychological factors may also play a significant role in consumption decisions. As the historical perspective for the subject, the modern consumption theory begins with Keynes’ (1936) analysis on the psychological foundation of the consumption behaviour in his General Theory (Palley 2010). D’Orlando and Sanfilippo (2010) discuss that major psychological motivations in individuals’ consumption decisions are a preference for procrastination, cognitive scarcity, myopia and prodigality, mental budgeting, and debt aversion. From the specific behavioural perspective, the psychology of framing may play a role in different responses to changes in financial or housing wealth (Shefrin and Thaler 1988; Thaler 1990). Thaler (1994) argues that wealth coming in the form of current income is almost entirely consumed, but wealth coming in the form of an increase in home equity or pension assets has little or no effect on consumption. The life cycle theory can be enriched by assuming that households have a set of ‘mental accounts’ with varying marginal propensities to consume. Poterba et al. (1995) suggest that stock price changes may affect consumption through the channels of wealth and the signalling effects (Leibenstein 1950). The well-known signalling phenomena are the ‘keeping up with the Joneses effect’ (Gali 1994), the “bandwagon effect” (Nadeau et al. 1993), the ‘Snob effect’, and the ‘Veblen effect’ (Veblen 1899; Leibenstein 1950). However, the behavioural wealth effect literature reveals little knowledge on this effect. As rare examples, Starr-McCluer (2002) and Groenewold (2003) find conflicting evidence vis-a-vis the conclusions reached by Poterba et al., (1995) who assert that wealth effects on consumption are likely to be small relative to signalling effects (Groenewold 2003). Schooley and Worden (2008) utilize survey data to examine the wealth effect within the context of the behavioural life cycle model of savings. Their results indicate that the likelihood of households spending is much more when their assets increase in value decreases with the portion of assets held in home equity.
2.2 Asymmetric responses of consumption to income and interest rate shocks
The asymmetries in consumption responses to positive and negative income and interest rate shocks have significant implications to economic policies. The literature generally reveals that income and interest rate shocks may have time-varying and asymmetric impacts on consumption with different country-level patterns. For example, Jawadi and Léoni (2012) find robust evidence of persistence, nonlinearity and cyclicity in the relationship between consumption and income. Bunn et al. (2018), based on UK survey data, highlight that MPCs out of negative income shocks are estimated to be much larger than those for positive shocks. Based on a survey data, Christelis et al. (2019) detect significant asymmetries of the MPC in response to positive and negative income shocks in the Netherlands.
On the other hand, there is a vast literature investigating the relationship between interest rates and consumption. The literature reveals that this linkage would be complex and uncertain (Keynes 1936), time dependent (Hansen 1996), and irrational (Campbell and Mankiw 1989). The evidence is mixed for the direction between two variables (i.e. for the inverse relation: Wright 1967; Boskin 1978; Mishkin 1976; Gylfason 1981, i.e. for the positive relation: Springer 1975) and also for the impact of interest rates on demand, the activity level, and consumption growth (i.e. Ludvigson et al. 2002). We have a special focus on the studies employing (real) interest rates in a declining and rising market environments due to our similar data structure. In this respect, Gourinchas and Rey (2018) argue that real interest rates do not systematically co-move with real consumption growth. Del Negro et al. (2019) document that both real interest rates and growth rates of per capita consumption decline globally due to possibly demographic shifts. Moreover, the magnitude of the relation between interest rates and consumption is also a subject of debate in the empirical studies. Previous literature generally suggests weak impact of interest rates on consumption (i.e. see Siokis 2005; Kapoor and Ravi 2009; MacDonald et al. 2011; Hviid and Kuchler 2017).
2.3 Nonlinear modelling, STAR family models, and nonlinear impulse response functions
The recent studies suggest that the linear approaches may not be appropriate if adjustments from disequilibrium are asymmetric for housing and stock markets (Tsai et al. 2011). In line with several findings in the empirical literature, our study also argues that nonlinear models may better explain the regime-dependent time variations and asymmetries in house prices, stock prices, income, and interest rates (also see Jawadi and Leoni 2012; Katrakilidis and Trachanas 2012). However, wealth effects on consumption are mostly analysed through linear models in the literature. Just few papers make use of nonlinear models. For example, by employing SETAR cointegration models and arguing that these models can better analyse the presence of asymmetric effects in the relationship between consumption and some of its determinants, Mignon and Dufrénot (2004) illustrate that consumption is described by two regimes that signify the presence of a heterogeneous behaviour. Teräsvirta and Anderson (1992) indicate that LSTAR and ESTAR models can widely describe different kinds of dynamic economic behaviours, which make the STAR family models as a promising tool for modelling nonlinearities in business cycles. As it is stated in González-Rivera (1998), a sharp transition function indicates two regimes, high versus low volatility (Markov-switching), whereas a smoother transition function allows for intermediate regimes that are continuous and may exhibit different degrees of smoothness. Hence, among these regime-switching models, the STAR family models best fit in our case, since consumption may possibly respond to changes in income, interest rates, house prices, and stock prices in a smooth way instead of a sharp transition.
On the other hand, a few studies apply impulse response analysis in order to examine the effects of shocks on consumption (see Lettau et al. 2002; Berger and Vavra 2015; Alp and Seven 2019). To the best of our knowledge, our study is the first one that applies nonlinear impulse response functions based on local projections (Jorda 2005) in order to analyse the asymmetric responses of household consumption to the shocks from housing wealth, stock wealth, income, and interest rates in different housing wealth regimes for a panel of countries. By employing this pioneering framework, we aim to distinguish the responses of consumption to the shocks in low- and high-housing wealth regimes. The results of STAR models illustrate the time-varying relationship between consumption and its determinants in both recession and expansion regimes that occur based on GDP (income) shocks. To examine asymmetries by employing nonlinear impulse response functions, we use house prices (housing wealth) for the regime-switching variable as the second most effective determinant of consumption in our modelling framework (Case et al. 2001; Dvornak and Kohler 2003; Benjamin et al. 2004; Iacoviello 2004, among others).
Overall, nonlinear (i.e. asymmetric and time-varying) responses of consumption to housing wealth, financial wealth, income, and interest rate shocks are emerging literature comparing to the prior rich literature of the linear wealth effect. However, the literature review reveals that heterogeneities in the consumption responses to the house price, stock price, income, and interest rate shocks have not been tested yet by simultaneously using STAR family models and nonlinear impulse response functions. Specifically, the latter modelling had no application previously. Our study is the first one of its kind.
3 Data and modelling strategy
3.1 Data
The empirical literature on the consumption–wealth effect channel suggests that there is a trade-off between developing a comprehensive independent variable set and data availability, specifically in a panel analysis framework. This paper involves a substantial effort to construct a wide range of a variable set for an unbalanced panel data from 25 countries, which are mostly OECD members, over the 2000Q1–2016Q4 period. The period and sample preference are shaped by data availability. The country sample includes Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Greece, Ireland, Israel, Italy, Japan, Korea, Netherlands, New Zealand, Norway, Portugal, Russia, South Africa, Spain, Sweden, Switzerland, the UK, and the USA.
In line with the literature (i.e. Ludvigson et al. 2002; Siokis 2005; MacDonald et al. 2011), we employ per capita household’s final consumption as the dependent variable and income, housing wealth, financial wealth, and also interest rates as the independent variables. All series are deflated by the consumer price index provided by the IFS (International Financial Statistics) database—except interest rate—and expressed in their natural logarithms. We used the Fisher equation in order to calculate the real interest rates. The Fisher equation states that the nominal interest (i) rate equals the real interest (ir) rate plus the expected rate of inflation (πe) (Fisher 1930).
Households’ final consumptionFootnote 1 and GDPFootnote 2 (as a proxy of income) are obtained from the same database, as well. Both data sets are seasonally adjusted and involve nominal domestic currency values expressed in US dollars. In the construction of income and consumption, we use exchange ratesFootnote 3 and populationFootnote 4 data provided by both the IFS and the World Bank databases, respectively. The population series is interpolated from annual data. Stock and house price indexes are used as proxy variables for financial wealth and housing wealth, respectively. Obtained from the OECD national accounts database,Footnote 5 real house prices are defined as the ratio of seasonally adjusted nominal house prices to the seasonally adjusted consumers’ expenditure deflator in each country. Sourced from the OECD (Main Economic Indicators: Finance) database,Footnote 6 stock price indices involve closing daily values of common stocks. For interest rates, the analysis employs 10-year government bond interest rates for all countries, except Israel, where it uses T-Bill interest rates. All data are retrieved from the IFS database, except Norway data which are provided by the Norges Bank.Footnote 7
In the light of the discussions in Catte et al. (2004), Li and Yao (2007), Slacelek (2009), Peltonen et al. (2012), among others, as the additional information set to better understand the evidence, we attempt to classify sample countries in Table 8 (in Appendix 3) based on the following the criteria: size of the economy (small vs. big), level of economic development (advanced vs. emerging), level of financial development (advanced vs. high), the role of banking and stock markets (bank vs. market based), income level (high vs. upper middle income), housing ownership ratio, ownership trends, and economic memberships (such as EU member, OECD member or an Anglo-Saxon country).
3.2 Modelling strategy: nonlinear adjustments to wealth effects
In order to examine nonlinear adjustments of consumption, the analysis considers the univariate Smooth Transition Autoregressive model (STAR), developed by Luukkonen et al. (1988). For a p order, the STAR (p) model yields:
where ct is consumption, xt includes a number of control variables that affect consumption, such as income, interest rates, stock prices, and housing prices, while F{γ(yt-d-c)} is the transition function from one regime to another with 0 ≤ F ≤ 1. This function allows for a smooth transition between the extreme regimes and depends on three parameters: yt−d is the transition variable, where d is the delay parameter (1 ≤ d ≤ p); γ is the speed of transition between two extreme regimes; and c is the half-way point between the two regimes. εt are independently, N(0, σε2). Luukkonen et al. (1988), Teräsvirta and Anderson (1992) and Teräsvirta (1994) define two types of STAR models depending on the nature of the transition function: Logistic STAR (LSTAR) and Exponential STAR (ESTAR) models. The transition function can be a logistic form:
where γ is the smooth parameter, measuring the transition speed from one regime to the other, and c indicates the threshold. When γ is greater than 0, the degree of autoregressive decay depends on the transition variable, St-d; when St-d is far above the threshold, the value of the transition function approaches to one; when St-d is far below the threshold, the value of the transition function approaches to zero. Hence, the LSTAR model characterizes asymmetric processes of consumption cycles. The transition function can be also described as an exponential form:
When γ is between 0 and ∞, the degree of autoregressive decay depends on the transition variable, St-d; as St-d is close to the threshold, the value of the transition function approaches to zero; as St-d moves farther away from the threshold, the value of the transition function is one. The ESTAR model suggests similar dynamics for low and high values of the transition variable, but different dynamics for the mid-range of the transition variable. Given, however, that we need to consider a number of other control variables that affect consumption, the empirical analysis makes use of a variant of the LSTAR or ESTAR modelling procedure, that of the Smooth Transition Autoregressive with Exogenous Transition (STARX) model, first applied by McMillan (2001). This version of nonlinear models employs as explanatory variables lagged control variables, rather than lagged dependent variables, to reveal the nonlinear smooth switching process of the dependent variable, which in our case is consumption.
The existing literature does not address wealth effect asymmetries through nonlinear impulse response functions based on the local projections (LP). To analyse the response of consumption to income, housing wealth, financial wealth and interest rates, we estimate impulse response functions using the LP method suggested by Jorda (2005) and applied in a different context by Barnichon and Brownlees (2019) and Adämmer (2019), among others. The LP model has many advantages over traditional structural vector autoregressive (SVAR) approach; for example, (1) LP models are easier to estimate since they rely merely on simple linear regressions, (2) the point or joint-wise inference is easily conducted, (3) the LP method is more robust to misspecifications, it does not suffer from the curse of dimensionality inherent to VARs, and (4) it is easier to accommodate for nonlinearities (Jorda 2005; Barnichon ve Brownlees 2019; Adämmer 2019).
We followed Auerbach and Gorodnichenko (2013) in order to estimate Eq. (4), and we used the Hodrick–Prescott filter to decompose the series.Footnote 8
In order to compute the LP approach for the estimation of impulse responses, the analysis uses the ‘lpirfs: Local Projections Impulse Response Functions package from the R software (Adämmer 2019). The data are split into two regimes by considering the housing wealth as the switching variable due to greater, persistent, and stable impacts of the housing market on consumption as documented in the literature (i.e. Catte et al. 2004; Case et al. 2005; 2011; Mishkin 2007). In this respect, one regime corresponds to a low-housing wealth regime, while the other regime represents the high-housing wealth regime. In Eq. (4), zt corresponds to housing wealth and an increase in zt (housing wealth) leads to a decrease in F(zt). If the values of F(zt) are close to zero, this implies a high-housing wealth regime (expansion regime), and vice versa.
4 Model results
4.1 Linearity tests
The first step of the method determines the optimal lag based on the Ljung and Box (1978) test of residual autocorrelation, along with the Akaike (1974) and Schwarz (1978) information criteria. Next, testing for linearity against STAR models nonlinearity, Luukkonen et al., (1988) suggest a test to get a linear approximation of the transition function using Taylor approximation. The null hypothesis is linearity. Once linearity is rejected, we determine the delay parameter d using the Teräsvirta (1994) criteria: firstly, the lag p of the autoregressive model, varying d, and then choosing the value that minimizes the probability of the linearity test. If the linearity is rejected for many values of d, then we choose the one for which the linearity is strongly rejected, where Pr is the probability of the Fisher statistic associated with the null hypothesis of linearity. The approach estimates the following auxiliary equation:
The null hypothesis for linearity test is α2j = α3j = α4j = 0, j = 1, …, p. We chose d when the linearity is rejected with the smallest test statistic of p-value. The results, along with the used lags, are reported in Table 1. They clearly illustrate the rejection of linearity across all countries in our sample at the 5% significance level.
In addition, given that this standard linearity test might reject the null hypothesis of linearity, we should also double check whether this linearity is really rejected because of nonlinearity and NOT autocorrelation, or outliers, or heteroscedasticity. Therefore, we also need to apply robust nonlinearity tests. More specifically, for robustness purposes, the analysis also uses the BDS test (Brock et al. 1987), developed within the chaos theory, which is a very popular test for nonlinearity. It is a nonparametric test, originally designed to test for independence and identical distribution (iid), but shown to also have power against a large gamma of linear and nonlinear alternatives (Brock et al. 1996). Moreover, it can be used as a portmanteau test or miss-specification test when applied to the residuals from a fitted model. Under fairly moderate regularity conditions, the BDS statistic converges in distribution to N(0, 1). The BDS test is a nonparametric test with the null hypothesis that the series under study are i.i.d., against an unspecified alternative. The test is based on the concept of correlation integral, a measure of spatial correlation in n-dimensional space. Table 2 reports the BDS statistic for embedding dimension8. The results strongly reject the null hypothesis of linearity at the 5% significance level, confirming those obtained in Table 1.
4.2 STAR models
Next, we choose the appropriate model of STAR family by testing the following restrictions:
If (6) is rejected, we choose the LSTAR model. If (6) is not rejected and (7) is rejected, we choose the ESTAR model. Finally, if (6) and (7) are accepted and (8) is rejected, then we select the LSTAR model. Table 3 reports the results of model specification. Based upon the selection criterion of Akaike (AIC), nonlinear models of all countries are determined. The results indicate that a LSTAR model is employed for the cases of Australia, Austria, Belgium, Canada, France, Germany, Greece, Ireland, Israel, Italy, Japan, Korea, Netherlands, New Zealand, Portugal, Russia, South Africa, Spain, Switzerland, and USA, while in the remaining cases (Denmark, Finland, Norway, and Sweden) an ESTAR model is accepted.
In the final step of the method, we provide the estimates of the modelling approach, through Nonlinear Least Squares. Moreover, to estimate γ, we divide the estimates by the standard deviation of consumption, σ(c), for the LSTAR model, and by the variance of consumption, σ2(c), for the ESTAR model (Granger and Teräsvirta 1993; Teräsvirta 1994). Hence, γ is scale-free and easier to interpret. The first regime corresponds to an expansion regime, and the second regime defines a recessive regime. The results are reported in Tables 4, 6, and 7, while Fig. 3 provides a summary of the relevant evidence.
In terms of the diagnostics, the Jarque and Béra test statistic clearly shows that the null hypothesis of normality in the residuals cannot be rejected at the 1% significance level. Similarly, the ARCH test statistic displays that the null hypothesis of homoscedasticity of the residuals at lag 12 cannot be rejected either. Furthermore, the Ljung–Box statistics of order 4 are insignificant, indicating the absence of any autocorrelation in the residuals. Overall, the diagnostics provide statistical support to the good statistical properties of our models.
4.3 Nonlinear impulse responses of consumption
To determine the responses of consumption to explanatory variables in both low- and high-housing wealth regimes, we employ nonlinear impulse response functions based on local projections (LP) for a 20-quarter forecasting horizon. This is the first application in the wealth effect and asymmetric consumption empirical literature. We present the visualized evidence in Figs. 1 and 2, and we also categorize the results in Table 5. In all countries, consumption responses to the shocks are asymmetric. In some countries, asymmetry is not only observed in relation to the magnitudes, but also in the direction of responses (i.e. positive or negative) as presented in Table 5.
This paper evaluates state dependency and asymmetry in the consumption responses by using a dataset from 25 countries, showing different economic, financial, and housing market characteristics. To generalize the results, this paper attempts to classify countries based on the following criteria (Case et al. 2005; Mishkin 2007): (1) direction, magnitude, state dependency (and its persistency importance) in income, interest rates, housing and financial wealth effects during high and low regimes (Tables 4 and 6; Fig. 3), (2) transition speeds in time variation (in Table 7, in Appendix 2), (3) asymmetry and its immediacy through nonlinear impulse response functions of consumptions (Figs. 1 and 2; Table 5). As indicated previously (see 3.1), to further improve the discussion, the countries are also classified in Table 8 (in Appendix 3) based on the multiple criteria.
However, each piece of evidence requires particular policy attention; to keep the discussion within limits, we briefly discuss the most important evidence obtained. Below, we present policy implications based on the evidence/data provided in Tables 4, 5, 6, 7, Figs. 1, 2, 3, and Appendices 1, 2, 3.
4.3.1 Evidence Set #1: direction and magnitude of income and interest rates
Our first evidence set reports the direction–magnitude of the income and interest rates. In line with the theoretical expectations, we first report that housing wealth, financial wealth, and income have a positive, and interest rates have a negative association with households’ consumption across all countries in both high and low regimes. These variables also generally show asymmetric and time-varying behaviour with mostly semi-strong or weak transition patterns (see Evidence Set 4/5/6).
In detail for the income and interest rate variables, in line with the literature, we secondly find that income is the most important determinant of the household consumption in both regimes across all countries. Like housing wealth and financial wealth, this variable also shows a time-varying and asymmetric behaviour and a higher impact during the expansionary period. The impact of the income is substantial (respectively, in first—expansionary—regime; in second—recessive—regime) in Greece (1.237; 0.962), Italy (1.080, 0.920), Israel (1.020; 0.991), the USA (1.014; 0.899), Australia (0.981; 0.919), and UK (0.955; 0.934).
Third, in line with the expectation (see, among others, Wright 1967; Boskin 1978; Mishkin 1976; Gylfason 1981), the inverse relation between interest rates and consumption across all sample countries is persistent evidence (Eggertsson et al. 2017; Gourinchas and Rey 2018). Taken into account real interest rates have been declining during our observation period due to the policies of central banks and market dynamics (Del Negro et al. 2019), we may argue that increases in consumption in a low-real interest rate (and rising market) environment would be related to gradually removing liquidity constraints and increasing leverage for households. Moreover, the impact of interest rates also shows a country-basis time-varying and asymmetric pattern. It is generally smaller in all countries when compared to the impact of housing wealth and financial wealth. However, interestingly, the impact of interest rates is higher than financial wealth in Greece, Ireland, Portugal, and South Africa in the high and low regimes, as well as in Israel, Italy, Russia, Spain, and Finland in the low regime. The impact of interest rates is also relatively higher in the following countries (respectively, in first regime; in second regime): Italy (0.89; 1.05), Sweden (0.80; 0.71), UK (0.79; 0.79), USA (0.75; 0.89), Australia (0.071; 0.63), Canada (0.070; 0.77), Finland (0.069; 0.80), and Greece (0.99; 0.051).
Regarding to implications of the first evidence set, we speculate that (1) higher and equally distributed income may result in less time-varying asymmetric consumption responses specifically during the recessionary period (see Husby 1983), (2) countries that show more interest rate sensitivity may implement their consumption-related interest rate policies very cautiously. Potential interest rate risks in those countries may result in negative consumption shocks due to the documented sensitivity.
4.3.2 Evidence Set #2: patterns of housing and financial wealth effects
Fourth, as one of the main findings of this research, in line with the literature, the housing wealth effect is generally larger than the financial wealth effect in most of the countries, irrespective of the state dependencies and asymmetries across different market regimes (see Table 4). For example, housing wealth has a significant impact on consumption, vis-à-vis the financial wealth effect (in the first and second regimes, respectively) in the following bank-based, albeit declining, housing ownership ratio countries: Greece (0.202; 0.108), Italy (0.183; 0.109), Spain (0.142; 0.083), Israel (0.125; 0.114), and Portugal (0.113; 0.063).
It may be interesting to note that as the financial wealth effect countries, the USA and the UK have also sizable housing wealth effects. Our findings also suggest that both wealth effects show a time-varying and asymmetric behaviour (i.e. see Case et al. 2011; Simo-Kengne et al. 2013; Mignon and Dufrénot 2004; Jawadi and Leoni 2012; Jawadi et al. 2017). However, while financial wealth declines significantly in the recessionary regime in some countries, the housing wealth effect generally shows relatively less decline across different market regimes. In line with the literature, this pattern implies a persistency in the positive housing wealth effect irrespective of the market regimes considered (see Case et al. 2005; 2011; Sousa 2005).
4.3.3 Evidence Set #3: classifying countries: size of wealth effect and transition speeds
The roles of financial wealth and housing wealth in consumption should be assessed on a country and market regime basis (Jawadi et al. 2017). Therefore, fifth, the present study attempts to classify countries depending on the state dependency (Table 4), transition speed (Table 7), asymmetry (Figs. 1, 2, Table 5) and argue that country-specific dominant wealth effect classification (Fig. 3) with the above information set would be a useful tool in policy-making.
We utilize the following approach to develop dominant wealth effect classification: if financial (housing) wealth effect is the primary wealth effect channel in consumption in both regimes for the country, we classify it as a financial (housing) wealth effect country. For example, having consistently higher housing wealth effect coefficient values than financial wealth effect coefficient values across time and different market regimes implies that this is a housing wealth effect country, or vice versa. If the coefficient values show a significant time-varying feature across different market regimes (Evidence Set 4/5), we classify this country as a mixed wealth effect country. In this case, we assume that the country’s dominant wealth effect channel is unclear, or it may change depending on the time and market regime. Figure 3 shows country classifications according to dominant wealth effects with also transition speed in time variation, as the summary information for Evidence Set 5 and Table 7.
Hence, the analysis considers Germany, Japan, Netherlands, Sweden, Switzerland, the UK and the USA as the financial wealth effect countries, and Australia, Denmark, Finland, Greece, Ireland, Israel, Italy, Norway, Portugal, Russia, South Africa, and Spain as the housing wealth effect countries. Interestingly, housing and financial wealth effects in New Zealand are equal in the first and the second regimes. Finally, Canada, Austria, Belgium, France, and Korea are classified as the mixed wealth effect countries, where their dominant wealth effect shows relatively higher time-varying features.
Sixth, our findings with the information provided in Appendix 3 also suggest that financial (housing) wealth effect countries mostly show market (bank)-based features (i.e. see Ludwig and Sløk 2004; Case et al. 2005; Slacalek 2009). Mixed wealth effect countries have the combinations of bank- and market-based features. As the limitation of this study, the model specification does not permit us to make a proper generalization for which factor(s) might play a role in this classification framework such as the level of housing market and stock market completeness, high- and low-income levels, being an Anglo-Saxon country or locating in continental Europe, or in (non-) euro area (Peltonen et al. 2012; Albacete and Lindner 2017).
The policymakers may utilize the observation in the above classification attempt into their housing and stock markets policies effective on consumption (and hence economic growth). For example, policymakers in housing (financial) wealth effect countries may specifically focus on housing (stock) market policies to induce consumption during specifically recession periods. However, policymakers should be aware of the risks of contradictory stock and housing market policies in mixed wealth effect countries. Although housing and stock markets generally show co-movements in the case of developed countries, the sector-specific fine-tuning policies, depending on the level of time-varying asymmetry, may further improve consumption-led growth (see Evidence Set 4/5/6).
4.3.4 Evidence Set #4: time-varying behaviour of model variables
Seventh, the findings further suggest that income, stock price, house price, and interest rate show a time-varying behaviour during the periods of positive and negative shocks in most of the countries. As the general policy implication, we suggest that countries may implement their consumption (and hence economic growth) policies during expansion and recession periods by also using expected time-varying effects of income, housing/stock prices, and interest rates.
Eight, differences in the coefficient values in the first and second regimes also provide additional information. In this respect, data suggest that state dependent income, housing wealth, and financial wealth effects are high (low) during expansionary (recessive) periods across all countries (Apergis and Miller 2006; Case and Quigley 2008). Therefore, partly in line with Berger et al. (2017) with a larger sample and additional variables, we cautiously conclude that during expansionary (recessive) periods, house and stock prices may result in larger (lower) value increases in housing and stock holdings and, hence, consumption responses. By contrast, the evidence of relatively lower coefficient values in the recessionary regime suggests that consumers do not reduce their consumption substantially when they lose their income and specifically housing wealth in recessionary periods as much as they increase it when their income and wealth increase in expansionary regimes (Case et al. 2005; 2011).
We define that the interest rate exposure of consumption is greater in the expansion regime only in Australia, Austria, Belgium, Greece, Ireland, Japan, Sweden, while it is equal in the UK. In the rest of the countries, the interest rate exposure of consumption is lower in the expansion regime than in the recession regime. The higher negative impact of interest rates during recessive periods possibly implies substitution effects for most of the countries (see Hviid and Kuchler 2017). This result may suggest that increases in interest rates lead to a greater decline in consumption in a recessionary regime, vis-à-vis in an expansionary regime. In those countries, policymakers may take into account time-varying responses of consumption to interest rates during recessionary regimes.
The country-level analyses a time-varying behaviour of the variables which present a rich information set. For example, data generally suggest a less significant time-varying behaviour in income variables, except in the cases of Spain, Portugal, and Greece. Apart from South Africa, Greece, and Portugal, a time-varying behaviour of interest rates does not have any significant effects on consumption. Data also suggest that time-varying behaviours of housing and financial wealth effects are more significant in bank-based and financially—relatively—less developed countries, such as Greece, Portugal, South Africa, and Spain. Country-level time variations may cautiously suggest that market completeness and economic development may play substantial roles in the magnitudes of time variations.
4.3.5 Evidence Set #5: transition speeds of parameters
Ninth, the estimated smooth parameter, γ, takes values higher than two, implying a strong transitionFootnote 9 from one regime to another in certain countries, such as in Greece, Ireland, Italy, Portugal, South Africa, Spain, the UK, and the USA, while in other cases, such as in Australia, Japan, Korea, New Zealand, Switzerland, Norway, Denmark, and Sweden, the γ parameter takes low values (close to one), suggesting a weak transition from one regime to another. Among the remaining countries, Finland, France, Germany, and Netherlands’ parameter values are ranging from 1.65 to 1.87, implying a semi-strong transition (Fig. 3; Table 7). This categorization is not an outcome of modelling but recommended by the authors for a practical purpose showing the distinction between strong and weak transitions.
This evidence set suggests that policymakers may implement their consumption sensitive stock and housing market policies based on the magnitude of this transition process. As an implication, housing market policies in housing wealth effect countries having also a strong transition pattern may require a continuous attention on housing market fundamentals. Policymakers in financial wealth effect and weak transition countries may have relatively less concern on the impact of negative shocks on house prices, except in those countries, which have a sizable housing wealth effect, such as the USA, the UK and New Zealand.
Because our modelling structure does not permit to assess the determinants of transition speed, we attempt to classify the sample countries based on their selected economic and financial characteristics and then try to develop a linkage between these features and transition classification. According to this experimental approach, the above evidence may imply that strong transition countries generally show pure or strong (in the case of the UK and the USA) housing wealth effect, relatively higher sensitivity on interest rates, and high, albeit declining, housing ownership ratio characteristics. Strong transition countries also show a mix of big–small and bank- and market-based characteristics (see Appendix 3). Among these countries, Greece, Italy, Spain, and Portugal show statistically significant and high levels of state dependency (Table 4). Moreover, while the UK and the USA have positively evolving economic conditions during the post-GFC period, the remaining strong transition countries have shown high economic risks during and after the GFC. By contrast, weak transition countries show a relatively low sensitivity on interest rate changes (except Australia), a mix of big or small, housing or financial wealth effect country, and bank- or market-based economy characteristics. Except for Norway, these countries have comparatively lower housing ownership ratios, ranging from 51 to 65%. However, in Japan and Korea, the housing ownership ratios have been increasing during the period under consideration.
4.3.6 Evidence Set #6: asymmetries based on nonlinear impulse response functions
Tenth, the results of the nonlinear impulse response functions imply that consumption responses to shocks may depend on the housing wealth regime, the sources of shock, and the subject country. In general, the results indicate that consumption responds immediately to shocks in all variables in both the low- and high-housing wealth regimes across all countries, while the effects of shocks last 20 quarters. There are two exceptions: Greece and Sweden. In Greece, income (GDP), housing wealth and financial wealth shocks immediately affect consumption in only four quarters in both regimes. After four quarters, the effects of shocks on consumption disappear. However, the shocks from interest rates affect consumption until 20 quarters. As another exception, in Sweden, interest rate shocks start to affect consumption after 12 quarters in the high-housing wealth regime.
Eleventh, the responses of consumption to shocks from all variables are asymmetric in high- and low-housing wealth regimes. However, in order to highlight one of the most interesting results, we group the countries in which the asymmetry is observed in the direction of the responses as positive or negative rather than in the magnitudes solely. In this respect, in both low- and high-housing wealth regimes, only in Israel and Portugal consumption shows asymmetric responses in the direction to housing wealth. For instance, in Israel, consumption responses are positive to the shocks arising from housing wealth in the low-housing wealth regime; however, in the high-housing wealth regime, consumption responses are negative to the shocks from housing wealth. Interestingly, we observe a relatively stronger asymmetry in the direction in financial wealth variable. In this respect, in both low- and high-housing wealth regimes, in Netherlands, Norway, Portugal, Spain, the UK, and in Switzerland, consumption shows asymmetric responses in (positive or negative) direction to financial wealth. In a country-level analysis, Switzerland, the UK, and more specifically, Portugal, show rather stronger asymmetries vis-a-vis other countries (see Table 5, Figs. 1 and 2). Our model specification does not explain why housing wealth and financial wealth may generate an opposite response in consumption during different market regimes. One explanation could be that country-specific factors may play a substantial role in this result. A second explanation could be that economic cycles may have serious adverse effects on the behaviour of housing and financial wealth. A third explanation could be that the lack of efficient policy framework during high and low market regimes may support the presence of opposite responses in relevance to the wealth effect.
5 Conclusion
Without considering the presence of nonlinearity of consumption, the differentials in stock prices, housing prices, income, and interest rates exposures may be ignored, which constitutes the main novelty of this work. The study primarily aimed to investigate whether, and to what extent, there were state dependency and asymmetry between housing wealth, financial wealth, interest rate, income, and consumption during expansionary and recessionary periods by employing STAR family models and nonlinear impulse response functions based on the local projections for 25 mostly OECD countries over the period from 2000 to 2016. As the methodological improvement, the latter modelling is the first in the asymmetric consumption and wealth effect empirical literature. The practical policy contribution of the study is that our evidence sets let us classify countries depending on their dominant wealth effect, and the characteristics of time variation, asymmetry, and transition speed in state dependency for income, interest rates, house prices, and stock prices during expansionary and recessive periods. The major findings of the investigation, along with their implications, can be summarized below.
First, in line with the literature, the results confirm that housing wealth, financial wealth, and income have a positive and interest rates have a negative association with household consumption during expansionary and recessive periods. Among these variables, income is the most important determinant of household consumption and the impact of interest rates is generally smaller (i.e. see Siokis 2005; Kapoor and Ravi 2009; Hviid and Kuchler 2017). The findings also suggest that housing wealth effects show persistency and generally larger than financial wealth effects in most of the countries across both regimes (i.e. see Catte et al. 2004; Sousa 2005; Bostic et al. 2009; Jawadi and Léoni 2012; Case et al. 2013; Bunn et al. 2018).
Second, as our main finding in all sample countries during positive and negative shock periods: nonlinear impulse response functions and STAR family models, respectively, imply that income, stock prices, interest rates, and house prices exposures of consumption generally show significant, immediate, persistent asymmetric and also persistent and an important time-varying behaviour (i.e. Simo-Kengne et al. 2013; Mignon and Dufrénot 2004; Jawadi and Sousa 2014; Jawadi et al. 2017; Berger et al. 2017; Hviid and Kuchler 2017). Third, we also find that the time-varying housing and financial wealth effects were generally high (low) during expansionary (recessionary) periods for all countries. Moreover, the evidence also suggests that there are some strong, but mostly semi-strong and weak transitions in independent variables during different market regimes. Interestingly, in line with Catte et al. (2004), Case and Quigley (2008), Case et al. (2005; 2011) and Jawadi and Leoni (2012), among others, the evidence implies that consumers do not reduce their consumption substantially when they lose their income and wealth in a recessionary period. Fourth, according to their country-specific dominant wealth effect, we classify, among others, Germany, Japan, the UK, and the USA as the financial wealth effect countries and Australia, Denmark, Greece, and Ireland as the housing wealth effect countries. As an interesting extension for this evidence, it is observed that financial (housing) wealth effect countries mostly show market (bank)-based features in line with the studies in the literature. As a general conclusion for policy-making, knowing the dynamics of country-specific dominant wealth effect, the features of state dependency, asymmetry, the level of transition speed would be supportive for monetary and fiscal policies.
We argue that the motives of an asymmetric consumption behaviour may involve both rational and physiological features. For example, it may be rational to observe a declining consumption during recessive period due to declining market values of housing wealth and financial wealth. However, despite specifically declining income levels, less decline in consumption over the recessive period may also imply some physiological elements (Thaler 1990, 1994; Genesove and Mayer 2001). This type of time-varying behaviour in the consumption may be explained by protecting (improving) the social status and the standard of living during recession (expansion) periods. The possible underlying reasons for this behaviour are also explained by absolute and relative income effects in Coskun et al. (2020). According to Duesenberry's (1949) consumption theory and as it is stated in Palley (2010), an increase in income and wealth may induce an increase in consumption only if the increase in household income raises a household's relative income position rather than her absolute income. Therefore, households with different amounts of wealth may respond differently to the same aggregate shock which may also deepen the asymmetry in the consumption function.
Taken into account the emerging housing and stock market-specific behavioural literature, we may expect that behavioural wealth effects may get more attention in the literature. In this respect, we propose that future research efforts may concentrate on investigating (1) the impact of wealth effect connected with the signalling effect on the consumption asymmetry during expansionary and recessionary periods, (2) country-level determinants of dominant wealth effect, time variation, asymmetry, and transmission, (3) developing fiscal and monetary tools for consumption policy depending on the behavioural aspects of state dependency, asymmetry, and transition metrics.
Change history
06 April 2022
The first reference “Adämmer P (2019)” was incompletely published. It has been updated as “Adämmer P (2019) lpirfs: An r package to estimate impulse response functions by local projections. The R J 11(2):421–438. https://doi.org/10.32614/RJ-2019-052”.
Notes
Available at: http://data.imf.org/regular.aspx?key=61545864 (accessed on: 10.6.2019).
Available at: http://data.imf.org/regular.aspx?key=61545864 (accessed on: 10.6.2019).
Available at: http://data.imf.org/regular.aspx?key=61545862 (accessed on: 10.6.2019).
Available at: https://databank.worldbank.org/data/reports.aspx?source=global-financial-development&preview=on# (accessed on: 10.6.2019). Total population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship.
Available at: https://stats.oecd.org/Index.aspx?DataSetCode=HOUSE_PRICES# (accessed on: 10.6.2019).
Available at: https://data.oecd.org/price/share-prices.htm#indicator-chart (accessed on: 10.6.2019).
Available at: http://data.imf.org/regular.aspx?key=61545867; https://www.norges-bank.no/en/Statistics/Interest-rates/Government-bonds-monthly/ (accessed on: 10.6.2019).
Adämmer (2019) points out that the parameter should be determined by the user.
\(F\left( {z_{t} } \right) = \frac{{e^{{\left( { - \gamma z_{t} } \right)}} }}{{\left( {1 + e^{{\left( { - \gamma z_{t} } \right)}} } \right)^{^{\prime}} }}{ }\)
In the above equation, the value of γ = 1.5 is determined by Auerbach and Gorodnichenko (2013). The value of smoothing parameter for quarterly data is λ = 1600 suggested by Hodrick and Prescott (1980; 1997) and tested by Ravn and Uhlig (2002) and applied by many researchers (i.e. Kydland and Prescott, 1990; Backus and Kehoe, 1992; Harvey and Trimbur, 2008; De Jong and Sakarya, 2016; Hamilton, 2018;
Adämmer, 2019).
In strong transition countries, the estimates indicate strong changes by showing how housing prices impact consumption (the housing wealth effect) across regimes. For instance, in the case of Greece, when changes in consumption (Δc) are higher than 0.291, the exposure to the housing price changes coefficient is 0.202 (the sum of 0.128 and 0.074). In contrast, in the other regime, the exposure coefficient of housing prices turns out to be 0.108 (the sum of 0.075 and 0.033). Evidently, the housing prices exposures of consumption are different across different regimes. In other words, in the case of a recessionary housing market, consumption reacts stronger than in the case of a bullish housing market, indicating the significance of the housing wealth effect for Greek consumers. By contrast, in the cases of a smooth γ parameter, the exposure is not substantially high. For instance, in the case of Switzerland, with a low γ smoothing parameter (1.05), the housing prices exposure of consumption remains relatively similar across both regimes, 0.049 versus 0.045.
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The authors thanks to three anonymous referees, whose remarks have been very helpful in preparing the final version of the paper. We also thank to Esen Alp Erbay for her proofread contribution.
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Coskun, Y., Apergis, N. & Alp Coskun, E. Nonlinear responses of consumption to wealth, income, and interest rate shocks. Empir Econ 63, 1293–1335 (2022). https://doi.org/10.1007/s00181-021-02171-8
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DOI: https://doi.org/10.1007/s00181-021-02171-8
Keywords
- Consumption asymmetry
- Wealth effect heterogeneity
- Behavioural wealth effect
- STAR family models
- Nonlinear impulse response functions