If students are rational, the average food consumption will be higher at University A.
At University A, the students pay a fixed fee of $500 per semester and can eat as much as they want. Therefore, there is no additional cost to eating more food. As a result, the students will have an incentive to eat as much as they can to get the most out of their fixed fee.
At University B, the students pay $500 for a book of meal tickets that allows them to eat up to 250 pounds of food per semester. If they eat more than 250 pounds, they have to pay an additional $2 per pound. This means that there is a cost associated with eating more food. As a result, the students will have an incentive to eat less food to avoid paying the additional cost.
Therefore, the average food consumption will be higher at University A where there is no additional cost to eating more food.