Income Elasticity of Demand

Income elasticity of demand is the responsiveness of quantity demanded to changes in income. The income elasticity of demand depends on the types of goods.

  • Normal goods: The demand increases with the increase in income. Elasticity has a positive sign (e > 0). If income elasticity of demand of a good is less than 1, it is a necessity good. If the elasticity of demand is greater than 1, it is a luxury good or a superior good.
  • Inferior goods: The demand decreases with increase in income. Elasticity has a negative sign (e < 0)

If the income elasticity is zero, a change in income doesn’t affect the demand for good. Such goods are called sticky goods.

Note that what constitutes an inferior product for people in some income range may be a normal product for people in a lower income group.

Examples:

Income elasticity = 0.4. It’s a normal good and demand is inelastic. A rise in incomes of 3% would lead to demand rising by 1.2%.

Income elasticity = 0.6. It’s an inferior good and demand is inelastic. A rise in income of 3% would lead to demand falling by 1.8%.

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Data Science in Finance: 9-Book Bundle

Data Science in Finance Book Bundle

Master R and Python for financial data science with our comprehensive bundle of 9 ebooks.

What's Included:

  • Getting Started with R
  • R Programming for Data Science
  • Data Visualization with R
  • Financial Time Series Analysis with R
  • Quantitative Trading Strategies with R
  • Derivatives with R
  • Credit Risk Modelling With R
  • Python for Data Science
  • Machine Learning in Finance using Python

Each book comes with PDFs, detailed explanations, step-by-step instructions, data files, and complete downloadable R code for all examples.