While I'm not familiar with the causes behind tuition increases at private universities, at many public schools tuition increases are necessary to offset decreases in state funding. While I'm sure there is a wide range of situations, at many schools funding from the state has been decreasing in terms of raw dollars (not even adjusted for inflation) for the past 20-30 years. At the same time, many of these schools have increases in the number of students, and therefore increases in the number of faculty, and also increases in the cost of benefits due to the increasing costs of healthcare, and tuition has to go up. All the money these days goes to k-12 education, and its leaving the universities in a hard situation.