Abstract
Previous research has concluded that the degree of return autocorrelation observed in index returns varies linearly with the volatility of the series, and that feedback traders are at least partly responsible for this phenomenon. Using daily Australian bond and equity market returns, we test this conclusion directly by using a Markov switching model for changing variance that explicitly allows the autocorrelation of returns to vary with the volatility regime. We find evidence that a significant proportion of investors in both the Australian equity and bond markets are positive feedback traders and are responsible for the observed increase in negative autocorrelation in index returns during periods of high and increasing volatility.
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Notes
Alternative explanations of return autocorrelations have been largely dismissed in the literature: (a) conditional risk premia—Fama (1971) (countered by e.g. Atchison et al. 1987; Conrad and Kaul 1988, 1989; Lo and MacKinlay 1988, 1990; Mech 1993); (b) nonsynchronous trading—Fischer (1966) and Scholes and Williams (1977) (countered by e.g. Atchison et al. 1987; Ogden 1997); and other market microstructure biases—see Cohen et al. (1980), Mech (1993) and Ogden (1997).
Using an alternative approach, Jackson (2003) examines individual investor trades for evidence of systematic aggregation of investment decisions made by ‘irrational’ investors. He finds evidence of a strong pattern consistent with negative feedback trading.
There also exists a body of work that examines feedback trading hypotheses in non-equity settings. For example, futures markets have been investigated by Kodres (1999) and Koutmos (2002). Specifically, Kodres (1999) analysed individual accounts in the S&P 500 index futures, while Koutmos (2002) looked at four international stock index futures contracts (S&P 500; Nikkei; DAX and CAC40). As yet another alternative example, Cohen and Shin (2002) investigated US Treasury notes. In all three cases the feedback trading hypothesis received reasonable support.
The mixture of two or more ‘normal’ distributions will have the effect of making the overall data appear skewed and leptokurtic assuming differing means and variances across the individual distributions.
A number of possible explanations for this type of behaviour have been proposed in the literature, including the presence of technical analysts’, extrapolative expectations, dynamic trading strategies, the liquidation of positions held by traders unable to meet margin calls, or the use of stop loss orders by investors. Evidence of this type of behaviour for both individual investors and institutions can be found in Bange (2000) and Nofsinger and Sias (1999), respectively. Li and Yung (2004), examining the ADR market, rule out a linkage between institutional herding and positive feedback trading.
All applications in this paper work at the aggregate market level. To simplify notation in the remaining equations, the ‘M’ subscript is suppressed.
These tests are reported later in Table 3.
We gratefully acknowledge an anonymous referee for drawing our attention to this potential line of reasoning.
Recently, Nam et al. (2006) explore asymmetry in the mean reversion of short horizon stock returns effectively in the context of this basic null model. Specifically, the asymmetry is captured by a simple dichotomisation between negative and positive returns, thereby representing a very basic from of non-linearity modelling.
Given a probability π of switching between two regimes, the expected duration of a regime is given by duration = (1 − π)−1 days.
Li and Lin (2003) represents a recent application of a three-regime switching model in the GARCH context, using Taiwan stock index data.
To conserve space, details are suppressed.
Smart traders are rational investors whose demand for an asset is adequately described by the CAPM of Sharpe (1964), i.e. a function of volatility, where an increase in volatility reduces the demand for an asset.
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Dean, W.G., Faff, R.W. Evidence of feedback trading with Markov switching regimes. Rev Quant Finan Acc 30, 133–151 (2008). https://doi.org/10.1007/s11156-007-0047-6
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DOI: https://doi.org/10.1007/s11156-007-0047-6