Suppose That the Marginal Benefit of Having a Security Guard

question 44

Multiple Choice

Suppose that the marginal benefit of having a security guard at the airport is MB₁,at the bank is MB₂,and at the mall is MB₃.The marginal cost of assigning security guard is the same for all three places,and it is represented by MC₂.
The optimal number of security guards at the airport is ____,the optimal number of security guards at the bank is _______,and the optimal number of security guards at the mall is ______.

• A) 3;3;6
• B) 6;4;3
• C) 5;4;2
• D) 6;5;4

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