Any serious empirical study of factor substitutability has to allow the data to display complementarity as well as substitutability. The standard approach reflecting this idea is a translog specification this is also the approach used by numerous studies analyzing the relative capital-skill...

Evidence from a sample of countries show that people roughly spend as much time watching television as earning their living. Moreover, television viewing and work hours are positively correlated across countries. A simple model based on complementarities in the organization of free time is...