If items are ___, an increase in the sale of one good causes an increase in the sale of the other (and vice versa).

If items are ___, an increase in the sale of one good causes an increase in the sale of the other (and vice versa).

If items are ___, an increase in the sale of one good causes an increase in the sale of the other (and vice versa).


a. inverse
b. neutral
c. complementary
d. substitute
e. negative


ANSWER: c


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