ECON 230 Lecture Notes - Price Elasticity Of Demand, Demand Curve, Economic Surplus

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To compute things like elasticity, the demand equation must be written in terms of q=, not p= . Lerners index = mark up = (p-mc)/p (increase/ price, percentage) Divide demand curve by (1+t), equate to mc. Sum identical curves horizontally -> f f/n. Monopsony: given supply s and demand d, mv= d, me= marginal price, mv = me, calculate equilibrium. Price is less than in a competitive market. Individual demand curve determines marginal value, or marginal utility, as a function of the quantity purchased; therefore, your marginal value (mv) schedule = demand curve. Additional cost of buying one more good is called marginal expenditure (me) . In competitive market, me is the average expenditure, which is the market price. Me is above supply curve decision to buy an extra unit raises the price for all units. If supply is elastic, firms have very little monopsony power.

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