people in a rural community sharw a forest . by agreement each family can cut 10 trees per year for personal use , One year , one person cuts 20 trees to buld a shop thats nicer that the neighbors shop . the new shop flourishes , despite the general disapproval nothing us done to punish the cheater . The neighbor seeing this decides that its okay to go ahead and take 25 trees . other neighbors follow suit. after a few years, the forest plot is gone , and everybody must travel much further for wood. whats this an example of ?