In this paper, we have obtained closed-form solutions in Cass-Koopmans grow
th models with heterogeneous agents. The relationship between the form of t
he production function and the dynamics of income distribution is made expl
icit. We then use this relationship to determine what production structure
is simultaneously consistent with facts on growth and income inequality. Ou
r empirical findings give support to models with decreasing returns in the
reproducible factor. JEL Classification: D3, O1, O4.