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Elasticity
LC Economics
| Term | Definition |
|---|---|
| Price Elasticity of Demand | Measures the percentage change in quantity demanded in response to a percentage change in price of a good or service |
| Relatively Elastic | A change in price will cause a more than proportionate change in quantity demanded. |
| Relatively Inelastic | A change in price will cause a less than proportionate change in quantity demanded. |
| Unitary elastic | A change percentage in price will cause a proportionate change in quantity demanded. Revenue for the firm will not change. A |
| Perfectly Elastic | An increase in price of that good causes quantity demand to fall to zero. |
| Perfectly Inelastic | A change in price of that good causes no change in quantity demanded |
| Goods that do NOT obey the law of demand will have this sign in a PED calculation | Plus |
| If a good has an elasticity calculation between 0 and -1 it is said to be... | Relatively Inelastic |
| If a good has PED calculation equal to 1 or -1 it is said to be... | Unitary Elastic |
| Factors that influence PED | The availability of close substitutes, Complementary goods, Is the commodity a luxury or necessity?, The proportion of income which is spent on the commodity, The durability of the commodity, Expectations as to future changes in price |
| Income Elasticity of Demand | Measures the percentage change in quantity demanded in response to a percentage change in real income |
| Normal Goods have a YED | Positive |
| Inferior Goods have a YED | Negative |
| Cross Elasticity of Demand | Measures the percentage change in quantity demanded in response to a percentage change in price of another specific good |
| Substitute Goods have a CED | Positive |
| Complementary Goods have a CED | Negative |
| Price Elasticity of Supply | Measures the relationship between the percentage change in quantity supplied in response to a percentage change in price of a good or service |
| Factors that influence PES | Firm’s Capacity, Mobility of Factors of Production, Time period, Nature of the product, Storage Costs, Cost Conditions, Products in joint supply, Stock |