24. Explain how the exchange rate for the Canadian dollar is determined. What happens to the rate if someone from the U.S. buys Canadian products or services? 25. If interest rates are increased to be higher in Canada than in the U.S. how does it affect the exchange rate for the Canadian dollar? 26. What is the law of comparative advantage? 27. What are the benets of barriers to trade? 28. What are the benets of free trade