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AbstractThe purpose of this study is to account for the increase in non-regular workers, namely, part-time and dispatched workers, in the Japanese economy from the early 2000s. Our contribution is that we use a firm-level panel dataset extracted from an administrative survey and distinguish between the short-run and long-run determinants of non-regular labor demand. Using the estimated parameters of the labor demand function, we decompose the rate of increase in the macroeconomic non-regular worker ratio into determinant factor contributions. Our major results can be summarized as follows. First, the firm-level determinants of the demand for part-time and dispatched workers significantly differ. Second, our results suggest that the non-regular job creation stimulated by the increased female labor supply plays an essential role relative to direct demand-side factors. Third, the microeconomic demand conditions for non-regular labor are widely dispersed among firms. Neither the demand factors examined in this study nor industrial differences can explain this heterogeneity.Authors Hiroshi Teruyama (Kyoto University) Yasuo Goto (Seijo University and the Research Institute of Economy, Trade and Industry) Sébastien Lechevalier (EHESS)Read the full paper&#160;