Week 3 Homework 1. Using a demand curve that shows how college enrollment can change with college tuition, examine whether the following would cause (1) movement along the demand curve or (2) a shift of the demand curve? D. An increase in incomes. ii) Lower tuition 111) An increase in textbook prices 2. Using supply demand analysis show what will be the change in equilibrium price and quantity when there is an increase in income as mentioned in 1).