Refer to the accompanying table. Pat's opportunity cost of delivering a pizza is making: Pizzas Made Per HourPizzas Delivered Per HourCorey126Pat1015 

With a flexible exchange-rate system, what determines the exchange rate between two countries?

(A) Supply and demand. (B) The day-to-day changes in one currency. (C) Inflation and interest rates. (D) The value of gold.

The three main sources of barriers to entry are monopoly resources, government regulation, and the firm's production process

a. True b. False Indicate whether the statement is true or false