Imagine a small island where Alice and Bob are the only two people who ever buy Kit Kats from the local shops. Suppose that Alice and Bob each has a standard, downward-sloping, straight-line demand curve for Kit Kats, and that for any given price, Bob will consume at least as many Kit Kats as Alice.

1. a)What can we say about how the elasticity of Bob's demand will vary along his demand curve?
2. b)What can we say about the elasticity of Bob's demand relative to Alice's?
3. c)Draw a set of three (or more) graphs to show how Alice's and Bob's individual demand curves can be combined into a market demand curve for the island. (Make sure to label all intercepts and other relevant points on the graphs.)