Suppose an assistant professor of economics is earning a salary of ​$ per year. One day she quits her​ job, sells ​$ worth of bonds that had been earning percent per​ year, and uses the funds to open a bookstore. At the end of the​ year, she shows an accounting profit of ​$ on her income tax return. What is her economic​ profit? Her economic profit for the year is ​$ nothing ​(round your answer to the nearest​ dollar).

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