that the return on US university endowments has been extremely high in recent decades, averaging 8.2 percent a year between 1980 and 2010 (and 7.2 percent for the period 1990–2010).25 To be sure, there have been ups and downs in each decade, with years of low or even negative returns, such as 2008–2009, and good years in which the average endowment grew by more than 10 percent. But the important point is that if we average over ten, twenty, or thirty years, we find extremely high returns, of the same sort I examined for the billionaires in the Forbes rankings.
