How Much of Barrier to Entry is Occupational Licensing?
利用各州许可法的差异和边界断点设计，研究发现职业许可使均衡劳动力供给平均减少17%至27%。
Abstract We exploit state variation in licensing laws to study the effect of licensing on occupational choice using a boundary discontinuity design. We find that licensing reduces equilibrium labour supply by an average of 17–27 per cent.