[Added: Solipsist made good comments that partially account for the phenomenon, and Douglas_Knight pointed out that the figure of $200m+ below should be $30m+]
This article reports that Harvard has 2,964 alumni worth $200+ million, with a total wealth of $622 billion. These figures are staggering:
- The university with the next highest figures (University of Pennsylvania) are ~2x less, and the figures for Yale (for example) are ~4x less.
- If you assume that Harvard has ~60 living classes of alumni, each of which has ~2,000 students, then the wealth per graduate coming from the alumni worth $200+ million alone is ~$5 million. Furthermore, the fraction of Harvard alumni with $200+ million is on the order of 2%. [Added: from here: "Of Americans, some 30,000 have more than $100m and 2,800 have more than $500m", so < 0.01% of Americans have that much money.]
Note that Bill Gates "only" has ~$75 billion and that Mark Zuckerberg "only" has ~$30 billion, so that they don't account for Harvard's decisive advantage over other universities.
What is going on here? Why would Harvard come out ahead by such a large margin? Its acceptance rate is smaller than those of Stanford, Yale and Princeton, but by no more than 25%. Moreover, this has been true historically
One can ask a similar question of University of Pennsylvania, which is significantly less selective than Yale and Princeton, but has a decisive advantage over them.
Some possible explanations for the discrepancy:
- Harvard selects students with higher expected earnings.
- Harvard selects students from families who are already wealthy (more than other top schools: the wealthy alumni are not self-made).
- Students who aspire to make a lot of money choose Harvard (over other top schools).
- Going to Harvard increases students' earning power (more than other top schools), for example, through better networking opportunities.
Regardless of which of these explanations hold, there remains a question of why they would hold.
Is Harvard a better choice than other universities for students who aspire to be wealthy than other top schools?
It might be worth comparing Harvard and Oxford (Oxford occupies a similar power law position in the UK, but some covariates differ in a possibly instructive way -- Oxford has a medieval college system which makes it harder to coordinate investments, and UK is relatively small). Harvard's endowment far outstrips all the Oxford colleges put together.
My general impression is that Oxford is more closely associated with political power than financial power. Cambridge has a far larger endowment than Oxford and in fact it's equivalent to some of the US Ivy League schools. But Christ Church, Oxford alone has had as many Prime Ministers among its alumni as Cambridge in its entirety.