While in college, Marty and Laura each buy 15 bus tickets per month. After they
graduate and have fulltime jobs, Marty buys 0 bus tickets per month and Laura buys 28
bus tickets per month. Comparing income elasticity of demand for bus tickets, Marty’s
a. is negative, and Laura’s is positive.
b. is positive, and Laura’s is negative.
c. is zero, and Laura’s is positive.
d. is zero, and Laura’s is negative.
Consider two individuals — Marquis and Serena — each of whom would like to wear
sweaters and eat tasty food. The gains from trade between Marquis and Serena are most
obvious in which of the following cases?
a. Marquis is very good at knitting sweaters and at cooking tasty food, but Serena’s
skills in both of these activities are very poor.
b. Marquis and Serena both are very good at cooking tasty food, but neither has the
necessary skills to knit a sweater.
c. Marquis’s cooking and knitting skills are very poor, and Serena’s cooking and
knitting skills are also very poor.
d. Marquis’s skills are such that he can produce only sweaters, and Serena’s skills are
such that she can produce only tasty food.
Table 337
Assume that Aruba and Iceland can switch between producing coolers and producing
radios at a constant rate.
Labor Hours
Needed to Make 1
CoolerRadio