Graphically, periods of federal budget deficits appear as upward-sloping portions of the debt-to-GDP line, while periods of budget surpluses appear as downward-sloping portions of the line

Explain why a monopolist does not have a supply curve

Which of the following statements is false?

A) A change in the price of good X will usually change the quantity supplied of good X, ceteris paribus. B) A change in the number of sellers of a good can change the supply of that good. C) Price and quantity supplied are directly related. D) A vertical supply curve represents a direct relationship between price and quantity supplied.