The aim of this paper is to test whether or not a temporary help service (THS) job benefits workers in Japan. By applying the average treatment effect on the treated estimation and its sensitivity tests to the Japanese survey data, we obtained the following findings. First, we observed evidence...

The fraction of contingent workers among all workers in Japan increased from 17% in 1986 to some 34% in 2008. This paper investigates the reason for this secular trend. Both demand and supply increases of contingent workers relative to regular workers are important, as evidenced by the stable...