Occupational and Internal Labor Markets in Japan

The distinction between internal and occupational labor markets requires the development of informative indicators that go beyond standard measures such as firm size, which are too vague. This article develops an alternative measure, based on the comparison between firm-specific and occupation-specific tenure, and applies it to Japanese occupational data. We believe that the proposed measure is useful not only in classifying different occupations according to the degree of labor market internalization but also in documenting changes over time in job definition, "reengineering" of the corporation, and the like.