Between the 1880s and the early 21st century, U.S. productivity increased at a constant annual rate

If the U.S. capital and financial account balance has a $30 million surplus and there was no change in official reserves during that year, we know that

A) the United States has a $30 million current account deficit. B) U.S. official reserves have increased by $30 million. C) the United States is a net lender. D) U.S. net foreign lending must equal $30 million. E) the United States has a $30 million current account surplus.

Economists generally use GDP to measure a nation's total output because it is

a. equal to the sales value of all transactions conducted during a period and thus can be easily calculated. b. the best available measure of the true costs of producing consumer goods. c. unaffected by changes in the prices of products over time. d. a relatively reliable measure of the value of all final product goods and services produced during a specific time period.