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α: calibrated so average coauthorship-adjusted count equals average raw count
In this work, the author enquires into the empirical validity and some implications of Yoram Ben-Porath's insights. Section 2 answers the question of whether there are the shapes and magnitudes of growth in wage profiles largely attributable to human capital investments. Section 3 tests the proposition that over the working age capacity wages decline before observed wages do. Implied timing of labor supply provides the test. In Section 4, implications are drawn from Ben-Porath's model for interpersonal differences and for the correlation between schooling and training. Copyright 1997 by University of Chicago Press.