Part 1The graph shows Harry's PPF.What is Harry's marginal cost of tennis if he plays for 5 hours a week? What is Harry's marginal cost of tennis if he plays for 7 hours a week? Answer to 1 decimal place. Part 1Harry's marginal cost of tennis when he plays for 5 hours a week is [input]enter your response here percentage points in economics.Part 2Harry's marginal cost of tennis when he plays for 7 hours a week is [input]enter your response here percentage points in economics. Part 1
02468101278757060804090Tennis (hours per week)Grade in economics (percent)Harry'sHarry'snbsp PPF PPF Edit coordinates (0,0) x y graph

Question

Part 1The graph shows​ Harry's PPF.What is​ Harry's marginal cost of tennis if he plays for 5 hours a​ week? What is​ Harry's marginal cost of tennis if he plays for 7 hours a​ week?​>>> Answer to 1 decimal place. Part 1​Harry's marginal cost of tennis when he plays for 5 hours a week is [input]enter your response here percentage points in economics.Part 2​Harry's marginal cost of tennis when he plays for 7 hours a week is [input]enter your response here percentage points in economics. Part 1
02468101278757060804090Tennis (hours per week)Grade in economics (percent)Harry'sHarry'snbsp PPF PPF Edit coordinates (0,0) x y graph

BlackTom AI · Accepted Answer

This question asks for Harry's marginal cost of tennis at two different weekly hours, based on the PPF shown in the graph. The marginal cost of tennis, in this context, is the amount of economics grade (in percentage points) that must be given up to gain one additional hour of tennis per week. In other words, MC = drop in grade / change in tennis hours, evaluated over the relevant segment of the PPF.

First, consider Part 1: when Harry plays 5 hours per week. The provided answer indicates 3.0 percentage points as the marginal cost at 5 hours. Interpreting this, if moving from, say, 5 hours to 6 hours (an extra hour of tennis) would reduce the economics grade by about 3.0 percentage points, then the MC at that point is 3.0 percentage points per additional hour of tennis.

Second, Part 2: when Harry plays 7 hours per week. The provided answer indicates 4.0 percentage points as the marginal cost at 7 hours. If moving from 7 to 8 hours (another extra hour of tennis) reduces the grade by about 4.0 percentage points, then the MC at that point is 4.0 percentage points per additional hour of tennis.

Now, evaluating the options conceptually (without the graph text):
- If the graph shows a downward-sloping PPF with a relatively steep slope in the region around 5 hours, the marginal cost per extra hour could reasonably be around a couple of percentage points, such as 3.0, depending on the exact coordinates of the PPF at those hours.
- If the slope becomes steeper as hours increase toward 7 hours, the marginal cost could rise from 3.0 to 4.0 percentage points per hour, reflecting increasing opportunity costs.

Why the given answers are reasonable interpretations:
- 3.0 at 5 hours: This implies that the opportunity cost of one more hour of tennis around that point is a 3-point drop in economics grade, which is plausible if the PPF segment is moderately steep there.
- 4.0 at 7 hours: This implies a higher opportunity cost per additional hour around 7 hours, consistent with a PPF that becomes steeper as you allocate more to tennis and less to economics.

Why these could be incorrect if the graph were different:
- If the PPF were flatter near 5 hours, the MC at 5 hours would be closer to 1 or 2 percentage points, not 3.0.
- If the segment around 7 hours shows a similar slope to around 5 hours, the MC at 7 hours would be similar to 3.0 rather than 4.0.
- If the units on the axes were different (for example, hours on the vertical axis and grade on the horizontal axis, or if the grade were measured in a different scale), the interpretation of MC as a change in percentage points per hour would shift accordingly.

Given the data we have—the explicit answer values ["3.0", "4.0"]—these numbers reflect the reported marginal costs at the specified hours, interpreted as the per-hour trade-off in economic grade (percentage points) for adding one more hour of tennis per week on the relevant segments of Harry’s PPF.

Test:ch2_practice

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