Extension services, product quality and yields: the case of grapes in Argentina
研究阿根廷门多萨葡萄种植户接受公共补贴推广培训后，发现产量短期下降但高质量葡萄品种采用增加，表明存在调整过程。
This article studies the impact of publicly subsidized agricultural extension services on yields and product quality. We use panel data from grape producers in Mendoza, Argentina to estimate the impacts of farmer trainings. We find a negative overall impact on yields and evidence of a positive average impact on the adoption of higher-quality grape varieties. By analyzing the dynamic pattern of the estimated effects, we find evidence of a temporary decrease in yields suggesting the existence of an adjustment process following the introduction of higher-quality grapes. The overall negative effect on yield is driven by a sharp drop in the year of participation. This fades after year one, and two to three years after treatment we observe increases in higher-quality grape production. Findings reinforce the importance of temporal dimension of extension services.