A Labour-Income-Based Measure of the Value of Human Capital: An Application to the States of the United States
We argue that a sensible measure of the aggregate value of human capital is the ratio of total labour income per capita to the wage of a person with zero years of schooling. The reason is that total labour income not only incorporates human capital, but also physical capital: given human capital, regions with higher physical capital will tend to have higher wages for all workers and, therefore, higher labour income. We find that one way to net out the effect of aggregate physical capital on labour income is to divide labour income by the wage of a zero-schooling worker. For the average US state, our measure suggests that the value of human capital during the 1980s grew at a much larger rate than schooling. The reason has to do with movements in the relative productivities of the different workers: in some sense, some workers and some types of schooling became a lot more relevant in the 1980s and, as a result, measured human capital increased.
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