英文文献：Agricultural Distortions in Sub-Saharan Africa: Trade and Welfare Indicators, 1961 to 2004
英文文献作者：Johanna Croser,Kym Anderson
英文文献摘要：
For decades, agricultural price and trade policies in Sub-Saharan Africa hampered farmers?’ contributions to economic growth and poverty reduction. While there has been much policy reform over the past two decades, the injections of agricultural development funding, together with on-going regional and global trade negotiations, have brought distortionary policies under the spotlight once again. A key question asked of those policies is: how much are they still reducing national economic welfare and trade? Economy-wide models are able to address that question, but they are not available for many poor countries. Even where they are, typically they apply to just one particular previous year and so are unable to provide trends in effects over time. This paper provides a partial-equilibrium alternative to economy-wide modelling, by drawing on a modification of so-called trade restrictiveness indexes to provide theoretically precise indicators of the trade and welfare effects of agricultural policy distortions to producer and consumer prices over the past half-century. We generate time series of country level indices, as well as Africa-wide aggregates. We also provide annual commodity market indices for the region, and we provide a sense of the relative importance of the key policy instruments used.