You shorted 50 contracts of 3-month USD/AUD futures at $0.7885. Three days later, the futures price $0.7995. The contract size is 125,000 AUD and the minimum margin is $2,500 for each contract. The maintenance margin is $1,500. Would you get a margin call in day 3? What would be your profit/loss if you closed out your position? Country A can produce either 150 units of donuts or 50 units of coffee and all the possible combinations in between. Country B can produce 150 units of donuts or 75 units of coffee and all the possible combinations in between. Would these two countries trade with each other? If they would, what would be each country specializes in, and what would be the likely price of coffee in terms of donuts