The withdrawal of older workers from the labor force creates a variety of economic challenges, including an increase in unused production capacity. Costs due to early retirement measured in terms of forgone output averaged 6.3 percent of potential gross domestic product in the OECD in 1998....

Medium- to long-term changes in unemployment appear to be closely correlated with medium- to long-term changes in private investment. This becomes a puzzle once we abandon the Keynesian framework as an explanation for medium-term movements in unemployment and replace it with the natural-rate...