Production functions used in economic growth theory are always limited to two inputs: labor and capital

The above figure shows the production possibility frontier for a country. What is the opportunity cost to move from point D to point B?

A) 12 tons of rice B) 15 thousand bottles of wine C) 6 thousand bottles of wine D) 9 thousand bottles of wine E) Nothing, it is a free lunch.

Fiat money is generally issued by

A) brokerage firms. B) private banks. C) major multinational corporations. D) central banks.