For consumers, goods A and B are complementary goods. The cost of a resource used in the production of A decreases. As a result

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When the cost of a resource used in the production of good A decreases, the supply of good A increases, leading to a decrease in the price of A. Since goods A and B are complements, a decrease in the price of A leads to an increase in demand for both A and B, raising the equilibrium price of B.

For Consumers, Goods a and B Are Complementary Goods