question archive The income elasticity of demand for a good is 0

The income elasticity of demand for a good is 0

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The income elasticity of demand for a good is 0.5. If demand decreased 5% as a result of a decrease in income, how much must income have declined?

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The percentage change in quantity demanded is the percentage change in income times the income elasticity, i.e.,

  • -5% = 0.5 * percentage change in income
  • percentage change income = -10%

That is, income must have declined by 10%.