If two goods are Complements, it means that a rise in the price of one commodity will lead to -
If two goods are complements, this means that a rise in the price of one commodity will induce a downward shift in demand for the other commodity. The prices of complementary or substitute goods also shift the demand curve. When the price of a good that complements a good decreases, then the quantity demanded of one increases and the demand for the other increases.