Growing condition variations and grain prices in Niger and Nigeria
研究了生长条件变化如何影响尼日尔和尼日利亚玉米和小米市场的价格关系，发现价格对应程度和可交易性是关键因素，并利用NDVI数据识别天气冲击年份，测量异常年份与正常年份的价格传导差异。
Abstract In this paper, we describe how both the existing degree of price correspondence and tradability are important factors explaining why and the extent to which grain price relationships adjust due to growing condition variations. For a set of maize and millet markets in Niger and Nigeria with different agro-ecological characteristics and strengths of price relationships, we use normalised difference vegetation index (NDVI) data to identify years with weather-related production shocks. We then measure the degree to which price transmission between the commercial hub and reference market in each country in the anomalous weather years varies from that in normal years.