Estimating Price Discounts for Low-Quality Maize in sub-Saharan Africa: Evidence from Benin
利用贝宁家庭数据，估计撒哈拉以南非洲市场对受损玉米的价格折扣，发现陈述偏好显示虫害增加10%导致价格折扣9%，而显示偏好仅为3%，且收获后折扣大于粮食短缺期。
This article uses household data from Benin to estimate the extent that markets in sub-Saharan Africa discount damaged maize. Stated preference methods indicate that a 10% increase in insect damage results in a 9% maize price discount. However, revealed preference methods indicate that this discount is only 3%. Discounts are larger immediately after harvest than they are in the lean period when maize is scarce. Our results help explain why many smallholder farmers sell maize at harvest rather than making the effort to preserve grain of good quality for later in the season when it may fetch a higher price.