We've learned that the own price elasticity of demand tells us which will be greater (in absolute value) price change or quantity change, as we move along the demand curve, due to a price change:
Elastic Demand: %Q > %P (in absolute value); meaning, revenue (or total expenditure) changes in the opposite direction of price, so:
Price increase leads to revenue decrease
Price decrease leads to revenue increase

Inelastic Demand: %Q < %P (in absolute value); meaning, revenue (or total expenditure) changes in the same direction of price, so:
Price increase leads to revenue increase
Price decrease leads to revenue decrease

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