question is

Joe and Sally live on a deserted island. There are only two relevant activities

on the island: making ice cream and chopping wood to make fires. Joe is macho

and better than Sally at chopping wood, while Sally is better than Joe at making

ice cream. Sally and Joe are perfect substitutes in both the production of ice

cream and wood chopping. How should Joe and Sally spend their time? Be

careful to take into account how much Joe and Sally like ice cream relative to

fire