Coffee price dynamics: an analysis of the retail-international price margin
研究了1980至2018年零售与国际咖啡价格价差的动态，发现价差无显著趋势，偏离是暂时的且调整不对称，可能与烘焙环节的市场集中度有关。
Abstract We examine the dynamics of the margin between retail and international coffee prices from 1980 to 2018. We find no significant trend in the margin using a robust procedure for estimating a trend. Further, we establish that any deviations in the margin are transitory for the full sample as well as the periods prior to and after the demise of the ICA, but with asymmetric adjustment. One of the reasons for the observed asymmetry could be market concentration in the coffee supply chain at the coffee roasting level, which allows coffee roasters to keep a higher share of the profits.