The price of an input needed to produce good A falls. As a result, the demand for good B shifts to the left. From this we can infer that:
Select one:
A. none of the other choices is correct
B. good A is used to produce good B.
C. goods A and B are substitutes.
D. good A is used to produce good B.
E. goods A and B are complements.
When price of an input needed to produce good A falls, it reduces the production cost of good A. As a result, supply of good A increases, shifting the supply curve for good A rightward.
As a result, price of good A decreases. When price of good A decreases, quantity demanded for good A will increase, according to the law of demand. If it causes demand for good B to shift to the left, that is demand for good B decreases, it means these two goods are substitute (substitute goods are goods that are used in place of the other) of each other.
Answer: option C
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