Which of the following countries has not experienced hyperinflation in the twentieth century?

Which of the following is an example of money?

A) currency inside the banks B) currency in your wallet C) credit card used as a payment for a good or service D) a debit card E) checks written as payment for a good or service

In the figure above, the curve is known as the

A) production possibilities frontier. B) substitution options frontier. C) production function. D) opportunity cost curve.