(b) What is the opportunity cost of one sh? (0) What accounts for the shape of the PPF? That is: what is atypical of this island economy that explains this shape? 2. Robinson Crusoe lives happily on a little island eating sh and coconuts. He is able to catch one sh for each hour he spends shing, and he could collect 10 coconuts per hour. These rates are the same no matter how much time he spends in each activity. He refuses to work more than 6 hours each day. (a) Draw Robinson's production possibility frontier (PPF). Be sure to show the units on the axes