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Natural circumstances and farm labor supply adjustment: the response of the farm labor supply to permanent and transitory natural events

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Abstract

Labor supply adjustment is one of the main mechanisms of farm households, which is often utilized to alleviate the impact of undesired natural circumstances. Nevertheless, how does the farm labor supply respond to the different attributes of natural circumstances, which may be permanent or transitory? This was an interesting research question and needed to be investigated. Therefore, using the matched data from the Socio-economic Survey (SES) of Thai Agricultural Households and Labor, the studies’ survey of saline soil, the times series information on regional rainfall in the Northeastern region of Thailand, and the implementation of regression analysis, including the income decomposition technique based on the permanent income hypothesis, the results showed that both permanent and transitory income generated by natural events had a significant effect on the farm labor supply. The farm labor supply had a higher response to transitory income that was determined by rainfall variation compared to permanent income, which was determined by both natural and non-natural factors. There was also evidence that natural permanent income generated by a natural event had a higher impact than non-natural permanent income. Overall, this paper found that natural circumstances could deteriorate the welfare of farm households by forcing them to work harder. Government support should thus be provided both in the short and long run.

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Data availability

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

Notes

  1. In the stricter version, which comprises all the assumptions of the permanent income hypothesis; for instance, complete financial market, no liquidity constraints, no precautionary saving behavior, etc., the response of consumption smoothing mechanisms should be expected; such as, savings, borrowing, labor supply adjustments, etc., to have permanent income close to zero, while the response to transitory income should be closer to one. However, the empirical results of most previous studies on this topic were rarely consistent with this prediction even in the developed countires.

  2. All the other factors that tended to be treated by the unit and affected as accidental or chance occurrences determined the transitory income (Friedman, 1957).

  3. The definition and measurement of permanent income was considerably discussed by Mayer (1972) and Chao (2001).

  4. Saline soil management includes leaching, drainage, and chemical treatments (Bauder et al., 2014; DERM, 2011; Machado and Serralheiro, 2017; Provin and Pitt, 2001). Jamil et al. (2011) indicated that more than 50% of the arable land would be salinized by the year 2050.

  5. The surveyed areas of saline soil may be greatly different to areas where households in the SES were located. Any households that were not located in the surveyed area of saline soil were eliminated. Additionally, in the 2005/2006 SES, only rice farmers were selected because the salt tolerance of the plants was different; thus, using a sample with many cultivated crops may cause the results to be inexact.

  6. Refer to the example of the calculation of EC50 and EC150 in Table 5.

  7. Shaw (1999) classified the EC1:5 value subject to four levels of clay components. This paper used the case of 10–20% clay because there was usually little clay in the soil components in Northeastern Thailand. Under this condition, the EC1:5 was categorized as: < 0.07 (very low), 0.07-0.14 (low) 0.15–0.33 (medium), 0.34–0.62 (high), 0.63–0.92 (very high), and > 0.93 (extreme).

  8. The SES of Thai agricultural households and labor asked about soil problems to which households answered with their subjective view. This study used this question to generate another type of saline soil measurement. The variable was 1 if households reported the existence of saline soil on their land, and 0 if otherwise.

  9. Since only one period of cross-sectional data was used, the permanent income was defined over a short time horizon like Paxson (1992). Therefore, permanent income was the expected income for a period of time that was conditional on a household’s resources at the beginning of the period.

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Acknowledgements

This research project is financially supported by Mahasarakham University, Thialand. The author would like to thank Dr. Butsara Yongkhamcha, department of biology, faculty of science, Mahasarakham University, Thailand, for her helpful advice about saline soil knowledge. The author is grateful to the Office of Agricultural Economics (OAE) for providing the Thailand Socio-Economic survey (SES) of agricultural household and labor data. The author also thanks the Meteorological Department of Thailand for providing rainfall data. In addition, the author thanks the Land Development Department (LDD) of Thailand, which provides and explains saline soil data sources.

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Appendix

Appendix

See Table 5 and Figs. 4, 5.

Table 5 The example of the calculation of EC1:5 value for some selected areas of Huai Dan Basin
Fig. 4
figure 4

Yield and cost of farm households classified by the value of EC1:5

Fig. 5
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Rainfall variation classified by rainfall stations

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Sirisankanan, A. Natural circumstances and farm labor supply adjustment: the response of the farm labor supply to permanent and transitory natural events. Environ Dev Sustain 25, 9935–9961 (2023). https://doi.org/10.1007/s10668-022-02469-2

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