Shirley macuga is the world's fastest typist and is also a world-famous brain surgeon. she earns $5,000/hour operating on brains. shirley can type her bills for a whole month's worth of surgery in 30 minutes and yet shirley hires a billing clerk to complete the surgery bills. the clerk requires all month to type the bills. the clerk is paid $2,000 per month. is shirley smart to hire the billing clerk? why or why not? a) no, because she can type faster than anyone else and do the job faster. b) yes, because shirley has a comparative advantage in surgery and so gains by specializing in surgery and hiring the clerk. c) yes, because shirley has an absolute advantage in typing and so should do both jobs.