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One reason that the quantity demanded of a good tends to rise as its price falls is that:
A.
the decrease in price shifts the supply curve downward.
B.
people feel a bit richer and increase their use of the good.
C.
demand has to rise to restore equilibrium after a price reduction.
D.
suppliers are willing to supply more at lower prices.
E.
the decrease in price shifts the demand curve upward.