中文摘要
本文利用密西西比州交错发生的监狱容量冲击,考察了私营监狱承包的影响。基于典型私营监狱合同(按每张占用床位每日支付费用)构建的模型,实证分析表明,私营监狱囚犯的服刑时间多出90天。这一数字亦可估计为平均刑期的4.8%。延迟释放侵蚀了私营承包所带来成本节约的一半,并与私营监狱中行为违规的可能性更高相关联。额外的服刑天数并未导致囚犯再犯的明显变化。
Abstract
This paper examines the impact of private prison contracting by exploiting staggered prison capacity shocks in Mississippi. Motivated by a model based on the typical private prison contract that pays a per diem for each occupied bed, the empirical analysis shows that private prison inmates serve 90 additional days. This is alternatively estimated as 4.8 percent of the average sentence. The delayed release erodes half of the cost savings offered by private contracting and is linked to the greater likelihood of conduct violations in private prisons. The additional days served do not lead to apparent changes in inmate recidivism.