Most Japanese workers are required to retire from their career firm by age 60. Yet the labor force participation rate of older men in Japan is the highest among industrialized countries, and most Japanese express a strong desire to continue working past age 60. One explanation for this paradox is that many firms reemploy their own retirees or provide them with assistance in finding new jobs with their subsidiaries or client firms.
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Clark et al. (1997) studied this question.