Forest Conservation and Slippage: Evidence from Mexico’s National Payments for Ecosystem Services Program
研究了墨西哥补偿地主保护森林的联邦计划，发现参与地块的森林砍伐率降低了50%，但存在两种泄漏效应，使计划在公共土地上的有效性平均降低约4%。
We investigate a Mexican federal program that compensates landowners for forest protection. We use matched controls from the program applicant pool to establish counterfactual deforestation rates. Deforestation was reduced by 50% in enrolled parcels, but expected average clearing rates without the program were low (0.8% per year), suggesting modest total avoided deforestation benefits. We test for two types of slippage: increased deforestation on other property belonging to program recipients and increased deforestation within markets where there are high levels of program participation. We find evidence of both, with substitution impacts reducing program effectiveness in common properties by about 4% on average. <i></i>