世界银行：保护主义、逃避和家庭福利：来自尼日利亚进口禁令的证据（英文版）

This paper analyzes the welfare impacts of import bans in Nigeria, and how these are shaped by evasion. Bans were not effectively enforced, and contributed to informal trade. The imposition of bans nonetheless increased consumer prices by 5.8% on average. However, price increases are substantially attenuated for goods for which trade policy is harder to enforce. Import bans disproportionately hurt the rich: the benefits of evasion are regressive.