Can someone help?? Which of the following situations requires no exchange of currency?
A)A furniture store in California buys rugs from an exporter in India.
B)A man living in the United States sends money to his brother in Spain.
C)A construction company in New York buys lumber grown in Oregon.
D)A Japanese family takes a vacation in Italy for three weeks.

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment. b. the allocation of resources between private markets and the public sector. c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t. d. differences in productivity. e. ones that think at the margin and respond to incentives and those that don’t.