Suppose that all economics professors are identical. They all derive $600 worth of utility from owning a full working copy of the current year's version of Stata or $200 worth of utility from owning a student version with some features disabled. Students don't care at all about the extra features of the full version. At any price p for the student version, student demand at MIT is 300 - 2p units per year. Assume that Stata has no marginal cost of selling its software.