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Social Sciences and History / Unit 13   SSH 1224 short lesson, about 20 seconds

Income, Cross-Price, Wage, Savings Elasticities

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The idea

Elasticity is any percentage change over another. Income elasticity of demand: percentage change in quantity demanded over percentage change in income. Cross-price elasticity: one good's quantity change over another good's price change. Wage elasticity of labor supply and the elasticity of savings follow the same form.

In practice

Positive cross-price: substitutes; negative: complements.

Where people slip

It applies in labor and financial markets too.

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