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21 In the following question you are asked to determine, other things equal, the effects of a given change in a determinant of demand or supply for product X upon (1) the demand (D) for, or supply (5) of, X: (2) the equilibrium price (A of X; and $3 the equilibrium quantity (Q of * A decrease in the number of buyers for good X will Multiple Choice O docrease D, decrease P. and decrome O O decrease S, increase P. and increme Q O Increase S. Increase P. and increase Q O Increase D, decreate P, and horse