Since 1950, expansions in the United States have become ________, while recessions have become ________

Aggregate income equals: a. the sum of income earned by all laborers in the world economy

b. the sum of income earned by all workers in the private sector. c. the sum of the income earned by all the resource suppliers in an economy. d. the total income of all employees after payment of income tax. e. the total income of all employees after purchases of necessities.

Firms that spend the greatest percentage of their revenue on advertising tend to be firms that sell

a. highly-differentiated consumer goods. b. goods produced by natural monopolies. c. agricultural products. d. products with a limited shelf life such as milk and lettuce.