Crops in crises: Shocks shape smallholders' diversification in rural Ethiopia
利用埃塞俄比亚全国面板数据，研究了气候冲击和社会经济冲击如何影响小农户的作物品种使用和多样化，发现干旱冲击增加改良种子使用，但严重干旱减少农业活动，且对贫困农户影响更大。
Crop diversity plays a central role in smallholder farmers' ability to cope with and adapt to shocks. Shifting crop varieties and diversifying the crop portfolio are common risk reduction strategies. This paper addresses the influence of covariate climate shocks and idiosyncratic socioeconomic shocks on crop variety use and crop species diversification by smallholder farmers using nationwide balanced panel data (2011/12, 2013/14, & 2015/16) from rural households in Ethiopia combined with village-level historical monthly rainfall and temperature data. We apply correlated random effects models, which control for time-invariant household unobservables. Past exposure to drought shocks increased the use of improved seed varieties in general and for wheat, while long-term average rainfall and lagged flood shocks enhance crop species diversity. Lagged temperature shocks increase improved seed use and crop species diversity. However, recurrent drought exposure and exposure to relatively more severe drought shocks significantly reduced overall agricultural activity. Idiosyncratic shocks, to a much lesser degree, influenced seed use and crop diversification decisions compared to covariate drought shocks. Heterogeneity analysis revealed that drought shock exposure on farmers with less than average farm sizes and other assets - compared to those better-off – increased their relative reliance on local seed use, reduced crop diversification, and reduced improved seed use. The results are robust to various sensitivity checks. Our findings are relevant for policy responses aiming to strengthen smallholders' ability to cope with and adapt to shocks: farmers' seed-based risk reduction strategies rely on access to seeds from both formal and informal seed systems, but policies addressing economic inequality are needed to enhance access to improved seeds and crop diversity for resource-poor socioeconomic groups.