Estimation of a Labour Supply Model with Censoring Due to Unemployment and Underemployment
提出一种劳动供给估计方法，通过剔除失业和不充分就业工人并扩展Heckman方法处理双重选择偏差，发现传统估计存在显著偏误，支持工人受约束的假设。
This study proposes and implements a method of labour supply estimation which is appropriate when the sample contains unemployed and underemployed workers. The estimation method consists of excluding unemployed and underemployed workers from the sample and then using (to avoid selection bias) an extension of Heckman's approach to the case where two correlated selection rules generate the sample. Hausman's specification test is then used to determine whether ignoring constrained workers has led to biases in traditional labour supply estimates, and the empirical results suggest that previous estimates of several important parameters are biased. Since the biases go in the direction that would be predicted by the hypothesis that the unemployed and underemployed are constrained, the results support this hypothesis.