Read the following excerpt from a report about some of the possible reasons college costs are increasing. A major concern related to higher education's business model is that colleges and universities cannot or will not control their cost increases. In for-profit industries when productivity goes up, salaries usually go up. This is different in public education. Based on the excerpt, how is higher education different from for-profit industries?

When for-profit industries increase their productivity, they tend to increase salaries. But for universities, costs are increasing despite the number of students they are graduating. This answer is based on inference, from the juxtaposition of higher education and the model of cost increase for for-profit industry. It seems, therefore, that the author's intent is to say that college costs increase with no measurable increase of productivity, measured by graduating students.