Last year, 1,000 cases of cough syrup were sold at $10; this year, 1,200 cases were sold
at $12 The most probable interpretation of these data is that the
a. supply and demand curves are shifting to the right.
b. supply and demand curves are shifting to the left.
c. supply curve has shifted to the left, with no change in demand.
d. demand curve has shifted to the right, with no change in supply.
The main reason why one nation trades with another is to
a. save its natural resources from rapid depletion.
b. exploit the advantages of specialization.
c. eliminate the danger of retaliation from other nations.
d. improve political alliances.
A tax is progressive if it raises a greater fraction of total tax revenue every year.