The famous observation that households and firms interacting in markets act as if they are guided by an "invisible hand" that leads them to desirable market outcomes comes from whose 1776 book? a. David Ricardo b. Thorstein Veblen c. John Maynard Keynes d. Adam Smith

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