Suppose an economy produces two goods, food and machines. this economy always operates on its production possibilities frontier. last year, it produced 1000 units of food and 47 machines. this year, it is producing 1050 units of food and 52 machines. which of the following events could not explain the increase in output? a. because the technological advance occurred in the machine-making industry, it will not be possible to increase food production without reducing machine production below 47. b. because the technological advance occurred in the machine-making industry, increases in output can only occur in the machine industry. c. in order to increase food production in these circumstances without reducing machine production, the economy must reduce inefficiencies. d. the technological advance reduced the amount of resources needed to produce 47 machines, so theseresources could be used to produce more food.