Measuring the welfare costs of supply management: The role of indirect benefits
研究发现，评估政府农业项目的社会成本时，必须考虑其他市场的情况；若忽略其他市场的间接收益，供给限制的社会成本可能被高估50%。
This study indicates that it is important to take into account what happens in other markets when evaluating the social costs of government agricultural programs. However, indirect benefits (costs) accruing in other markets are only to be measured if those markets are distorted (P ≠ MC). An empirical application from supply management in Canadian agriculture is provided. The results suggest that, if other markets are ignored, the social costs of supply restrictions may be overestimated by 50 percent. This is quite a large relative error indeed if one is interested in evaluating public policy from a social welfare standpoint.