The following information is for questions 18) - 23). There are three industries on the primitive island of Istria. All of them hire labor from households (families). Stone-finders find sharp stones and sell them to stone-axe makers. Stone-axe makers make stone axes out of stones (purchased from stone-finders) and wooden sticks (purchased from stick-makers). Stick-makers buy stone axes, cut small branches off trees and make them into sticks. Stone axes are sold not just to stick makers but also to households (to clobber deer, which households eat themselves; households never sell deer). Sticks are sold not just to stone-axes makers but also to households (to make fires to cook deer). Istrians have no contact of any kind with the outside world