On Crop Biodiversity, Risk Exposure, and Food Security in the Highlands of Ethiopia
研究埃塞俄比亚高地作物遗传多样性对农场生产率和生产风险的影响，发现多样性通过降低风险成本（主要影响偏度而非方差）来提升福利，且在退化土地上价值更大。
Abstract This paper investigates the effects of crop genetic diversity on farm productivity and production risk in the highlands of Ethiopia. Using a moment‐based approach, the analysis uses a stochastic production function capturing mean, variance, and skewness effects. Welfare implications of diversity are evaluated using a certainty equivalent, measured as expected income minus a risk premium (reflecting the cost of risk). We find that the effect of diversity on skewness dominates its effect on variance, meaning that diversity reduces the cost of risk. The analysis also shows that the beneficial effects of diversity become of greater value in degraded land.