ap microeconomics 2012 scoring guidelines · 2019. 5. 20. · utility per dollar spent on bagels...

AP ® MICROECONOMICS 2012 SCORING GUIDELINES © 2012 The College Board. Visit the College Board on the Web: www.collegeboard.org. Question 2 6 points (3 + 1 + 1 + 1) (a) 3 points: • One point is earned for determining the total utility, which is 24. • One point is earned for stating that three bagels and five toy cars will be purchased. • One point is earned for explaining that with this combination of bagels and toys, the marginal utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point is earned for stating that Theresa’s demand for bagels will not change because the increase in the price of wheat will affect the supply of bagels, not the demand. (c) 1 point: • One point is earned for stating that bagels are inferior goods. (d) 1 point: • One point is earned for calculating the cross-price elasticity for toy cars and blocks: -0.04/0.10 = -0.4

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AP® MICROECONOMICS 2012 SCORING GUIDELINES

Question 2 6 points (3 + 1 + 1 + 1)

(a) 3 points:

• One point is earned for determining the total utility, which is 24. • One point is earned for stating that three bagels and five toy cars will be purchased. • One point is earned for explaining that with this combination of bagels and toys, the marginal

utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point:

• One point is earned for stating that Theresa’s demand for bagels will not change because the increase in the price of wheat will affect the supply of bagels, not the demand.

• One point is earned for stating that bagels are inferior goods.

(d) 1 point: • One point is earned for calculating the cross-price elasticity for toy cars and blocks:

-0.04/0.10 = -0.4

Page 2: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

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Page 4: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

Page 5: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

Page 6: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

Page 7: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

Page 8: AP MICROECONOMICS 2012 SCORING GUIDELINES · 2019. 5. 20. · utility per dollar spent on bagels equals the marginal utility per dollar spent on toy cars. (b) 1 point: • One point

AP® MICROECONOMICS 2012 SCORING COMMENTARY

Question 2 Overview Part (a) of this question tested students’ ability to find total utility on the basis of marginal utility, and to identify the optimal consumption bundle. Part (b) assessed whether students understood that a change in the price of an input affects the supply curve and not the demand curve. Part (c) tested whether students knew how to interpret a negative value for income elasticity. Part (d) assessed whether students could calculate the value of cross-price elasticity. Sample: 2A Score: 6 The student answers all parts of the question correctly and so earned all 6 points. Sample: 2B Score: 3 The student lost 1 point in part (b) for incorrectly stating that “demand … will decrease.” The student lost 1 point in part (c) for incorrectly stating that “bagels are normal goods.” The student lost 1 point in part (d) for failing to correctly calculate the cross-price elasticity for toy cars and blocks. Sample: 2C Score: 1 The student earned 1 point in part (c) for correctly stating that “bagels are inferior goods.”

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