An exchange rate is the price of one country's currency in terms of another country's currency

You believe that the total amount of goods produced in the United States has generally increased over the years. In a time-series graph illustrating the total amount produced, you expect to find

A) an upward trend. B) no relationship between time and the amount of goods produced. C) an inverse relationship between time and the amount of goods produced. D) a linear relationship.

When income is $15,000, the amount of income income taxes owed is $2,000; when income increases to $20,000, the amount owed increases to $3,000. The marginal tax rate in this case is

A) 20 percent. B) 13.3 percent. C) 15 percent. D) 25 percent.