Here are three hypothetical situations: a) Individuals are concerned that a recession is coming and crank up their savings to weather it out. As a result, a mild recession is exacerbated into a deeper one. b) An unregulated fishery attracts fishermen who rapidly deplete the fish population. c) Corn prices go up in one season and farmers plant more corn than can be absorbed in the marketplace resulting in plummeting prices. What do these situations have in common