Which of the following would not be considered physical capital?

A tariff is a tax imposed by a government on

A) imports. B) exports. C) services. D) luxury items.

Total market demand can be calculated by

A) horizontally summing individual demand curves at each and every price level. B) vertically summing individual demand curves at each and every income level. C) adding up the largest quantity demanded by each individual. D) looking at the changes in the products' popularity.