One of the most-discussed higher education policy proposals from President Donald Trump has been a proposal to tax the endowments of wealthy colleges that are seen as not using enough money on financial aid. Key Trump supporter Rep. Tom Reed (R-NY) has introduced legislation requiring colleges with endowments over $1 billion to spend at least 25% of all investment returns on financial aid, much to the chagrin of wealthy colleges.
This proposal does not take into account the size of a college—which means that colleges with similar endowment levels can have vastly different levels of resources. For example, Vassar College and North Carolina State University had endowments just under $1 billion as of June 2015, but the sizes of the institutions are far different. Vassar has about 2,500 undergraduate students, while NC State has nearly ten times as many.
Another important factor is the financial need of students. Colleges can have similar sizes and similar endowment levels, but differ substantially in their number of Pell recipients (a proxy for low-income status). Washington State University and the University of Missouri-Columbia both have endowments around $900 million, but Washington State enrolled 3,000 more Pell recipients than Mizzou in spite of enrolling 4,000 fewer undergraduates. This means that Mizzou has the ability to target more aid to their Pell recipients should they choose to do so.