We define a country's technology as a triple of efficiencies: one for unskilled labor, one for skilled labor, and one for capital. We find a negative cross-country correlation between the efficiency of unskilled labor and the efficiencies of skilled labor and capital. We interpret this finding...

In this paper we apply the same framework totime-series data from the United States over theperiod 1963–1992. We find that throughout thisperiod the efficiencies of skilled labor and capitalhave risen. The efficiency of unskilled laborhas risen in tandem with those of the otherfactors in the...

Whether or not the marginal product of capital (MPK) differs across countriesis a question that keeps coming up in discussions of comparative economic developmentand patterns of capital flows. Using easily accessible macroeconomic datawe find that MPKs are remarkably similar across countries....