Q. 3. Is Zoe using marginal cost and marginal revenue correctly in her analysis? Explain the errors in her analysis, if any. [Hint: Think about Kevin Blake’s questions.]

  • Concept:  Using marginal cost (MC) and marginal revenue (MR) to make profit-maximizing decisions

  • MC = additional cost from doing one more of something

  • MR = additional revenue from doing one more of something

  • Do more when MR > MC.  Do less when MR < MC.  This will maximize profits.

  • MR/MC method is usually used to find profit-maximizing quantity of output.


  • But it can be used for many other things.


  • Here, it’s used to find how many hours to stay open.


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