GCEEconomicsElasticity2019

A 10% rise in the price of commodity X leads to a 15% increase in the quantity demanded of commodity Y. This indicates that X and Y are

Acomplementary goods with a cross elasticity of -1.5
Bsubstitute goods with a cross elasticity of +1.5CORRECT
Cinferior goods with a cross elasticity of +1.5
Dcomplementary goods with a cross elasticity of +1.5
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Why the answer is B, and why the others tempt you.
Cross price elasticity of demand = % change in Qd of Y / % change in price of X = 15/10 = +1.5. A positive cross elasticity indicates that X and Y are substitutes; as the price of X rises, consumers switch to Y, increasing its demand. Complements have negative cross elasticity.
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