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...

In recent decades, most industrialized countries experienced declining population growth rates caused by declining fertility and associated with rising life expectancy. We analyze the effect of continuing demographic change on medium- and long-run economic growth by setting forth an R&D-based...

At the close of World War II, there were wide-ranging debates about the future of economic developments. Historical experience has since shown that these forecasts were uniformly too pessimistic. Expectations for the American economy focused on the likelihood of secular stagnation; this topic...