When the balance of trade is in balance, we know with certainty that a. the value of capital exports equals the value of capital imports. b. the value of exports of goods equals the value of imports of goods. c. the value of all debit transactions equals the value of all credit transactions. d. the value of exports of goods and services equals the value of imports of goods and services.

The school cafeteria can make pizza for approximately $0.30 a slice. the cost of kitchen use and cafeteria staff runs about $200 per day. the pizza den nearby will deliver whole pizzas for $9.00 each. the cafeteria staff cuts the pizza into eight slices and serves them in the usual cafeteria line. with no cooking duties, the staff can be reduced by half, for a fixed cost of $75 per day. should the school cafeteria make or buy its pizzas?