Bart and Lisa are both optimizing consumers in the markets for shirts and hats, where they pay $100 for a shirt and $50 for a hat. Bart buys 8 shirts and 4 hats, while Lisa buys 6 shirts and 12 hats. From this information, we can infer that Bart's marginal rate of substitution is _____ hats per shirt, while Lisa's is _____.

The Bank of Japan is Japan's central bank. As part of its duties, the Bank of Japan would

A) provide banking services to Japan's citizens and firms. B) provide banking services to foreigners. C) control the quantity of money in circulation in Japan. D) change tax rates.

George Webb Restaurant collects on the average $5 per customer at its breakfast & lunch diner. Its variable cost per customer averages $3, and its annual fixed cost is $40,000 . If George Webb wants to make a profit of $20,000 per year at the diner, it will have to serve__________ customers per year

a. 10,000 customers b. 20,000 customers c. 30,000 customers d. 40,000 customers e. 50,000 customers