世界银行：重温新兴市场经济体贸易的收益：东亚和东非部分经济体的案例（英文版）

Following the gains from variety literature, this paper estimates the welfare impact of growth of the variety of imported goods in 28 countries in East Africa and East Asia and compares the results. While estimating the gains from variety, the elasticities of substitution are estimated for each country at the Harmonized System six-digit level of disaggregation. More than 100,000 elasticities are estimated, and the paper constructs an exact price index to measure the welfare gains from variety