Should we internalise inter-temporal production spillovers in the case of pest resistance?
研究了农药效率因全球施用而下降导致的跨期生产溢出问题，提出动态财政方案来纠正效率损失，并发现该方案虽能恢复社会最优路径但会改变农药停用时间，需额外退出方案才能实现最优切换时机。
The efficiency of pesticides decreases with their global application by farmers. Within a strategic dynamic framework, this results in inter-temporal production spillovers. We analyse a dynamic fiscal scheme that can be implemented to correct these inefficiencies. We show that it is able to restore socially optimal paths but that the final time of pesticide use differs. With this scheme, farmers have a tendency to switch to a backstop pest-control technology earlier than is socially optimal. We also show that an additional exit fiscal scheme is necessary to obtain a switching time equal to the socially optimal one. We test our theoretical results on a stylised illustration, showing that the best policy strategy consists of implementing a lump-sum transfer in order to delete the revenue effect induced by the dynamic fiscal scheme.