Slippage in Conservation Cost Sharing
研究农业保护补贴是否导致农民在更脆弱土地上扩大耕种，从而抵消环境改善效果。基于马里兰州农场数据，发现补贴未针对水质改善，且虽增加保护措施采用，但减少植被覆盖土地比例，环境效益部分被抵消。
We examine whether subsidies for conservation on working farmland induce farmers to expand cultivation on more vulnerable land, potentially offsetting reductions in environmental spillovers, using a switching regression model with endogenous switching and censored endogenous variables applied to Maryland farm‐level data. We find no indication that cost share awards are targeted toward water quality improvements. Receipt of cost sharing increases conservation practice adoption but not the shares of land allocated to conservation, implying little adverse selection in awards. Cost sharing decreases the share of land allocated to vegetative cover, so that environmental quality improvements from conservation are likely offset to some degree.