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2. Suppose the relationship between your study time and your grade on a Economics midterm is given by the following table:

If you study forYour grade will be
4 hours80
5 hours88
6 hours94


What is the "marginal grade improvement (MGI)" of the 5th hour of studying?

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3. What is the "marginal grade improvement (MGI)" of the 6th hour of studying?

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4. Why might the MGI be diminishing?

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