In this paper, I introduce depression to the economics of human health and aging. Based on studies from happiness research, depression is conceptualized as a drastic loss of utility and value of life (life satisfaction) for unchanged fundamentals. The model is used to explain how untreated...

Conventional R&D-based growth theory argues that productivity growth is driven by population growth but the data suggest that the erstwhile positive correlation between population and productivity turned negative during the 20th century. In order to resolve this problem we integrate R&D-based...