You have a business in a college town that bakes cakes for special occasions (like birthdays) and delivers them to college students in their dorms and apartments. It's very popular with parents of out-of-state students who cannot be there to celebrate with their kids. You know for certain that your good is a normal good, not an inferior good. Assume you expand into another college town, where incomes are higher AND tuition is higher, which means (on average) the incomes of parents of out-of-state students are ALSO higher, what would be the expected result?
a) Increase in demand for your cake-delivery service.
b) Decrease in demand for your cake-delivery service.
c) No change in demand for your cake-delivery service.
d) Shift to the left in the demand curve for your cake-delivery service.