Alia only likes tacos, which she buys from two local restaurants - Alberto's and Roberto's - so let's define good x=Alberto's tacos and good y=Roberto's tacos. But let's face it, Roberto's is the best, and we would have to offer Alia 3 Alberto's tacos in order to convince her to give up 2 Roberto's tacos, regardless of how much she is currently consuming.

a) Write Alia's utility function and draw some of her indifference curves.

b) If Px=$2, Py=$4, and I=$24, how much of each type of taco will Aila purchase?

c) What if Roberto's tacos go on sale for $2 each?