In an economy with firm-specific human capital, it is shown that (i) a distribution of nonlabor income will generally induce a distribution of net returns to specific investments; (ii) at the individual level nonlabor income and net returns will be positively related over some range and...

In this paper we estimate the demand for refined copper in the United States, taking account of the fact that, during much of the sample period, copper supplies were rationed. The model employed here, which is closely related to the Tobit model, is much simpler than those models previously used...