Every week, Mary plays the piano for three hours, and her grade on each English test is 80 percent Last week, after playing for three hours, Mary considered playing for another hour. She decided to play for another hour and cut her study time by one hour But last week, her English grade fell to 60 percent. Did Mary make her decision on the margin? OA Mary's decision was not made at the margin because she could have chosen not to play the piano but didn't OB. Mary's decision was not made at the margin because the marginal cost of a lower grade always exceeds its marginal benefit Oc. Mary's decision was made at the margin because her grade fell by only 20 percentage points OD Mary made her decision at the margin because she considered the benefit and cost of one additional hour of playing the piano OE Mary's decision was not made at the margin because she didn't compare the total benefit and total cost of a third hour of playing the piano
Every week, Mary plays the piano for three hours, and her grade on each English test is 80 percent Last week, after playing for three hours, Mary considered playing for another hour. She decided to play for another hour and cut her study time by one hour But last week, her English grade fell to 60 percent. Did Mary make her decision on the margin? OA Mary's decision was not made at the margin because she could have chosen not to play the piano but didn't OB. Mary's decision was not made at the margin because the marginal cost of a lower grade always exceeds its marginal benefit Oc. Mary's decision was made at the margin because her grade fell by only 20 percentage points OD Mary made her decision at the margin because she considered the benefit and cost of one additional hour of playing the piano OE Mary's decision was not made at the margin because she didn't compare the total benefit and total cost of a third hour of playing the piano
Chapter2: Scarcity And Opportunity Costs
Section: Chapter Questions
Problem 14E
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Transcribed Image Text:Every week, Mary plays the piano for three hours, and her grade on each English test is 80 percent.
Last week, after playing for three hours, Mary considered playing for another hour. She decided to play for another hour and cut her study time by one hour
But last week, her English grade fell to 60 percent.
Did Mary make her decision on the margin?
OA Mary's decision was not made at the margin because she could have chosen not to play the piano but didn't
OB. Mary's decision was not made at the margin because the marginal cost of a lower grade always exceeds its marginal benefit
Oc. Mary's decision was made at the margin because her grade fell by only 20 percentage points
OD Mary made her decision at the margin because she considered the benefit and cost of one additional hour of playing the piano
OE Mary's decision was not made at the margin because she didn't compare the total benefit and total cost of a third hour of playing the piano
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