Very recently, the debt-to-GDP ratio has been:

According to economist Robert Gordon, major innovations in the United States have been concentrated in ________ waves of growth

A) two B) three C) four D) five

In a free market system, competition generates economic efficiency only when

A) individuals take into account the full opportunity cost of their actions. B) consumers are motivated by a sense of the greater good, not their own self-interest. C) firms are motivated by a sense of the greater good, not their desire for profit. D) economic decisions are taken out the hands of individuals and placed in the hands of government officials.