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Crop yield convergence across districts in India’s poorest state

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Abstract

Bihar, India’s poorest state, witnessed impressive yield growth in its three principal crops during the last decade or so. This paper examines whether a reduction in regional yield disparities accompanied these state-level productivity gains. The convergence test allows the district-specific element of productivity to vary with time, thus permitting divergence in interim phases. District rice yields converged towards a common growth path. The results for wheat and maize are not as conclusive. However, there is strong evidence of divergence for each crop in recent years. This divergence, nonetheless, happens in the presence of club convergence. The club classification transcends agro-climatic boundaries, indicating a role for policy to aid growth in the lagging districts. The shifts in credit allocation over the years do not appear to be driving the yield divergence, highlighting the limitations of a macro credit-driven policy.

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Notes

  1. The absence of absolute convergence indicates a rise in the cross-district disparity in yields.

  2. Section 2 sketches the procedure of identifying convergence clubs. See Phillips and Sul (2007) for a detailed discussion.

  3. Yet, the evidence on the credit-growth relationship is varied. For instance, Binswanger and Khandkher (1995) and Subbarao (2012) estimate a positive effect, while Burgess and Pande (2005) and Narayanan (2016) find a negligible to weak impact.

  4. The parameter a in the logt regression equals \(\log H_1 - 2\log \left( {\frac{{\left( {N^{ - 1}\left( {1 - N^{ - 1}} \right)\mathop {\sum}\nolimits_i {\sigma _i^2} } \right)^{\frac{1}{2}}}}{b}} \right)\). For the derivation of the regression Eq. (8), see Phillips and Sul (2007).

  5. Level convergence also requires regularity conditions on the common growth component μt.

  6. Refer to Phillips and Sul (2007) and Phillips and Sul (2009) for details on the clustering procedure.

  7. It is possible to aim for more clubs by increasing the threshold for t-test statistic. I restrict my choice of the critical value to zero to minimize the number of convergence clubs.

  8. The club identification follows a slightly different algorithm relative to Phillips and Sul (2007, 2009). Specifically, I follow the revision suggested in Schnurbus et al. (2017) which makes the manual interventions in the former procedure redundant. The analysis makes use of STATA’s psecta package (Du 2018).

  9. 100 period (year) replications with districts used to identify resampling clusters. The results are robust when employing higher or lower replications.

  10. One-tailed test statistic corresponding to 36 degrees of freedom.

  11. Table 8 in the appendix lists the districts according to their club classification for each crop.

  12. Agriculture commands around 60 percent of the priority sector lending, illustrating the sector’s central role in development policy. In contrast, small and medium enterprises account for approximately 25 percent.

  13. The Wald supremum statistic is used to test the null hypothesis of no structural break in district yields (Perron 2006). I use asymmetric trimming of 17%, which is slightly higher than the 15% proposed by Andrews (1993) because the latter value is unable to resolve the identification problem.

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Acknowledgements

Thanks to two anonymous referees and the associate editor for their comments and suggestions, which led to significant improvements. The findings, interpretations, and conclusions expressed in this paper are entirely those of the author. They do not necessarily represent the views of the International Bank for Reconstruction and Development/World Bank and its affiliated organizations, or those of the Executive Directors of the World Bank or the governments they represent.

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Correspondence to Rishabh Sinha.

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Appendix

Appendix

Tables 79

Table 7 (a): Descriptive statistics—Southern districts. (b): Descriptive statistics—Northwestern districts. (c): Descriptive statistics—Northeastern districts
Table 8 Convergence clubs
Table 9 Agricultural credit across sub-periods, periods split using statistical break in district yields

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Sinha, R. Crop yield convergence across districts in India’s poorest state. J Prod Anal 57, 41–59 (2022). https://doi.org/10.1007/s11123-021-00618-9

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