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  2. Price elasticity of demand - Wikipedia

    en.wikipedia.org/wiki/Price_elasticity_of_demand

    When the price elasticity of demand is unit (or unitary) elastic (E d = −1), the percentage change in quantity demanded is equal to that in price, so a change in price will not affect total revenue. When the price elasticity of demand is relatively elastic (−∞ < E d < −1), the percentage change in quantity demanded is greater than that ...

  3. Ramsey problem - Wikipedia

    en.wikipedia.org/wiki/Ramsey_problem

    Under Ramsey pricing, the price markup over marginal cost is inverse to the price elasticity of demand and the Price elasticity of supply: the more elastic the product's demand or supply, the smaller the markup. Frank P. Ramsey found this 1927 in the context of Optimal taxation: the more elastic the demand or supply, the smaller the optimal tax ...

  4. Slutsky equation - Wikipedia

    en.wikipedia.org/wiki/Slutsky_equation

    where ε p is the (uncompensated) price elasticity, ε p h is the compensated price elasticity, ε w,i the income elasticity of good i, and b j the budget share of good j. Overall, in simple words, the Slutsky equation states the total change in demand consists of an income effect and a substitution effect and both effects collectively must ...

  5. Elasticity (economics) - Wikipedia

    en.wikipedia.org/wiki/Elasticity_(economics)

    Formula for cross-price elasticity. Cross-price elasticity of demand (or cross elasticity of demand) measures the sensitivity between the quantity demanded in one good when there is a change in the price of another good. [17] As a common elasticity, it follows a similar formula to price elasticity of demand.

  6. Law of demand - Wikipedia

    en.wikipedia.org/wiki/Law_of_demand

    The Cross elasticity of demand, also commonly referred to as the Cross-price elasticity of demand, allows companies to establish competitive prices against substitute goods and complementary goods. The metric figure produced by the equation thus determines the strength of both the relationship and competition between the two goods. [15]

  7. Lerner index - Wikipedia

    en.wikipedia.org/wiki/Lerner_Index

    The index ranges from 0 to 1. A perfectly competitive firm charges P = MC, L = 0; such a firm has no market power. An oligopolist or monopolist charges P > MC, so its index is L > 0, but the extent of its markup depends on the elasticity (the price-sensitivity) of demand and strategic interaction with competing firms. The index rises to 1 if ...

  8. Demand curve - Wikipedia

    en.wikipedia.org/wiki/Demand_curve

    The price elasticity of demand is a measure of the sensitivity of the quantity variable, Q, to changes in the price variable, P. Its value answers the question of how much the quantity will change in percentage terms after a 1% change in the price. This is thus important in determining how revenue will change. The elasticity is negative because ...

  9. Marshall–Lerner condition - Wikipedia

    en.wikipedia.org/wiki/Marshall–Lerner_condition

    Note that a common source of confusion is the price used in the elasticities, which determines whether an elasticity is positive or negative. Demand elasticities are ordinarily the elasticity of demand for a good with respect to the price of the good, and they ordinarily are negative numbers.