The College Board reports that since 2000, college tuition and fees have increased by 160 percent while the share of family income required to pay for tuition at public four-year colleges has risen from 5 percent in 2000 to 14 percent in 2015. This is an example of condition.

Alaska king crab fishing in the 1960s and '70s was a dangerous but rich fishery. boats from as far away as california and japan braved the treacherous gulf of alaska crossing to reach the abundant king crab beds in cook inlet and bristol bay. suddenly, in the early 1980s, the fishery crashed due to over fishing. all crabbing in those areas ended. to this day, there is no crabbing in bristol bay or cook inlet. a. how would an economist explain the decline of the alaska king crab fishery