While bonds are safer compared to equities
Country A\'s opportunity cost of producing 1 bottle of wine is 2 tons of wheat (100 tons of wheat / 50 bottles of wine). Country B\'s opportunity cost of producing 1 ton of wheat is 0.5 bottles of wine, because 60 bottles of wine / 120 tons of wheat. Country B\'s opportunity cost of producing 1 bottle of wine is 2 tons of wheat, because 120 tons of wheat / 60 bottles of wine.