If the price of goods X rises and the quantity demanded of goods Y increases then the two goods X and Y must be

  • A inferior goods
  • B substitutes
  • C complements
  • D free goods

The correct answer is B. substitutes

Substitute goods are goods that can be used in place of each other.

When the price of a good (like X) rises, consumers may switch to a cheaper alternative (like Y), thus increasing the demand for the substitute good. 

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