>A while back someone referred to a study showing an inverse relationship
>between population growth and productivity growth. Could whomever (it may
>have been Doug) gave the reference do so again?
Cutler, David M., James M. Poterba, Louise M. Sheiner, and Lawrence H. Summers (1990). "An Aging Society: Opportunity or Challenge?," Brookings Papers on Economic Activity 1, pp. 1-73.