This article treats education as a sequential choice that is made unde
r uncertainty. A simple model is used to explore the effects of abilit
y, high school preparation, preferences for schooling, the borrowing r
ate, and ex post payoffs to college on the probability of various post
-secondary college outcomes and the ex ante return to starting college
. The model motivates an empirical method of accounting for uncertaint
y about educational outcomes and for nonlinearity in the relationship
between years of education and earnings when estimating the expected r
eturn to the first year of college.