Cooperative Property Rights and Development: Evidence from Land Reform in El Salvador: A Comment
指出Montero（2022）关于萨尔瓦多土地改革的研究存在数据重复和样本量不足的问题，其关于合作产权提高收入并压缩工资分布的结论不可信。
Montero (2022) explores a discontinuity in a land reform in El Salvador and reports two main findings. First, relative to outside-owned haciendas operated by contract workers, the productivity of worker-owned cooperatives is higher for staple crops and lower for cash-crop. Second, cooperative property rights increase workers' incomes and compress wage distributions. In this comment, we show that the latter result rests on two mistakes: three-quarters of the observations are duplicates and income inequality is calculated over too few workers to be meaningful. When corrected, the data sources and research design provide no credible evidence regarding the causal effects of ownership structure on income levels and inequality.