A student has a chance to see Katy Perry in concert. The student also has a major
economics exam in the morning. If the student goes to the concert,
a. she will get a lower grade on the economics exam.
b. the opportunity cost of the concert is time spent studying.
c. this decision implies a trade-off.
d. All of the above are correct.
In January, 2,500 quarts of ice cream are sold in Boston at $2 a quart. In February,
3,000 quarts are sold at $2.50 a quart. This change in quantity sold and price may have
been caused by
a. a reduction in wages in the Boston area.
b. the introduction of labor-saving automated ice cream-packing machinery.
c. the release of a medical study showing that ice cream consumption improves mental
health.
d. the decision by Boston ice cream sellers to eliminate discount coupons.
If good “A” is represented on the horizontal axis and good “B” on the vertical axis, then