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Inaccurate fertilizer content and its effect on the estimation of production functions

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  • Khor, Ling Yee
  • Zeller, Manfred

Abstract

Discrepancy between the labeled content and the real content of fertilizer is a growing problem. It exists in many countries, such as Bangladesh, Cambodia, China, Nigeria, Tanzania, Vietnam, and more. We analyze in our article the effect of low quality fertilizer, which contains less nitrogen than is advertised on the packaging. We show that this could lead to bias in the estimation of production functions. Using panel data from the Hebei Province of China and the Monte Carlo simulation, we examine the magnitude of the bias across different levels of fertilizer quality under various scenarios of uncertainty. We find that ignoring the uncertainty leads to an overestimation of fertilizer's effectiveness. Depending on the scenarios of uncertainty, the bias could even switch the sign of fertilizer's partial elasticity.

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  • Khor, Ling Yee & Zeller, Manfred, 2014. "Inaccurate fertilizer content and its effect on the estimation of production functions," China Economic Review, Elsevier, vol. 30(C), pages 123-132.
    • Handle: RePEc:eee:chieco:v:30:y:2014:i:c:p:123-132
    DOI: 10.1016/j.chieco.2014.06.003
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    More about this item

    Keywords

    Estimation bias; Low quality fertilizer; Production function; Technical efficiency;
    All these keywords.

    JEL classification:

    • Q12 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Micro Analysis of Farm Firms, Farm Households, and Farm Input Markets
    • Q18 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Agricultural Policy; Food Policy; Animal Welfare Policy
    • D8 - Microeconomics - - Information, Knowledge, and Uncertainty

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