College: Different Fees for Different Majors?

In the first couple weeks of any survey course in the principles of economics, students are taught that prices are determined by the interactions of consumers (demand) and producers (supply). Prices for many things, such as oil, or of common stocks, constantly change with the frequent shifts in the willingness of consumers and producers to buy or sell the good or service in question.Yet the price of college--tuition fees--seems to be determined differently.