Human Capital Accumulation and Depreciation<xref ref-type="fn" rid="FN1">*</xref>

In the spirit of T. W. Schultz's contributions to the theory and measurement of human capital, this article discusses the dimensions of human capital, and the technologies used for its accumulation and maintenance. The article emphasizes the role of health as a dimension of human capital that influences the efficiency of acquisition and maintenance of cognitive skills, and the relationship between worker productivity and depreciation of cognitive skills over the life cycle. Copyright 2008, Oxford University Press.