If the long-run average total cost curve is downward-sloping, then the firm is experiencing decreasing returns to scale

Which of the following is true?

A) The real interest rate can never be zero. B) The nominal interest rate is usually negative. C) The real interest rate is always positive. D) The nominal interest rate is usually less than the real interest rate. E) The real interest rate can be negative.

Purchasing power parity is defined as

A) an equal value of money across currencies. B) a currency whose value rises. C) an equal value of interest rates across currencies. D) a currency whose value falls. E) a constant value for a currency.