As long as supply and demand curves have their normal shape (the demand curves have a negative

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Question:

As long as supply and demand curves have their normal shape (the demand curves have a negative slope while supply curves have a positive slope), if there is a tax, the equilibrium quantity must _______ and the price that buyers pay must _______. *
a. Fall; rise
b. Fall; fall
c. Rise; fall
d. Rise; rise