총 106개의 산업별 자료를 바탕으로 추정한 결과 일본은 40대의 비중이 커질수록 노동생산성이 높아지는 것으로 나타났다.
As a result of estimation based on a total of 106 industry-specific data, it was found that labor productivity in Japan increased as the proportion of those in their 40s increased.