Productivity gaps, price advantages and competitiveness in E.C. agriculture
使用多边Törnqvist指数估算欧共体10国在小麦、甜菜、生猪和牛奶生产中的相对效率水平，并计算购买力平价以比较各国的价格优势，分析竞争扭曲的原因。
Multilateral Törnqvist indexes are used to estimate relative levels of efficiency in wheat, beet, hog and milk production for the EC-10 countries. Purchasing Power Parities for aggregate input are computed, thanks to specific PPPs for the agricultural sector on the basic heading level. They make possible a comparison of price advantages (for output and input) among countries. Explanations of these variations in terms of real exchange rates, green parities, tax policy and output quality suggest that considerable distortions of competition subsist in spite of the agricultural common market.