If you choose between two summer jobs, what is the one you do not choose called? . a. trade-off . b. opportunity cost . c. decision at the margin . d. opportunity at the margin . (i know this is such a simple question all i would have to do is google the meanings but im getting the meanings confused : / i thought the answer was c but if someone could maybe simplify the meaning so explain to me why im wrong i would really appreciate it. )

8. problems and applications q8there are four consumers willing to pay the following amounts for haircuts, and there are four haircutting businesses with the following costs: consumers' willingness to payyvette: $35cho: $15sean: $45bob: $25firms' costsfirm a: $40firm b: $20firm c: $10firm d: $30each firm has the capacity to produce only one haircut.for should be given.which businesses should cut hair? check all that apply.firm afirm bfirm cfirm dwhich consumers should have their hair cut? check all that apply.bobchoseanyvettethe maximum possible total surplus is