What is the maximum amount of good X that can be purchased if X and Y are the only two goods available for purchase and Px = $10, Py = $20, Y = 5, and M = 400?

Suppliers recognize there is a shortage in the market for their product when they notice that

a. the quantity supplied exceeds the quantity demanded b. the quantity demanded is falling c. inventories are falling d. production exceeds new orders for the product e. government economists announce a shortage exists

Net exports must equal zero for any economy

a. that is closed. b. for which Y = C + I + G. c. for which S = Y - C - G. d. All of the above are correct.