Courtesy of my ECON professor Two men decide to go fishing on a Saturday. They rent equipment, take off early in the morning and enjoy a relaxing day out on the water. Unfortunately, they only catch one fish apiece. On the ride home, they share their disappointment. The first man says, ""You know, with all the money we spent, these fish cost us about $500 each."" The second man says, ""Wow! It's a good thing we didn't catch anymore.""