During which of the following decades was the debt-to-GDP ratio generally highest in the United States?

Which of the following is included in both M1 and M2?

a. traveler's checks b. checkable deposits c. currency d. all of the above.

Consider leaf burning that generates negative externalities. The private cost is

a. less than the external cost b. greater than social benefit c. understated by the amount of the social cost d. less than the social cost e. shared with third parties