[Excerpt] As noted by Bowen and Sosa, their projections of the supply side of the academic labor market, which are typical of those used in other studies, are based on a number of simplifying assumptions. Similarly, their proposed policy remedies to increase the flow of new doctorates, such as increasing financial support for graduate students and shortening the time it takes students to receive degrees, are made presenting only scanty evidence on the likely magnitude of supply responses to these changes. This essay, which draws heavily from my study (Ehrenberg 1991), reviews the academic literature and available data (from a wide range of sources) to summarize what we know about new doctorate supply and what we need to know to make informed policy decisions.