ECON101 Lecture Notes - Lecture 24: Perfect Competition, Allocative Efficiency, Natural Monopoly

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Economics 101 lecture 24: perfect competition in the long run and. Equilibrium occurs when = 0 (profit = 0) or when p = mc = atc. Initially: s0, d0, p0, q0, d0, q0 and = 0. Now: s0, d1, p1, q1, d1, q1, > 0. Long run: positive economic profits causes entry of new firms which causes the supply to increase (orange) Now: s*, d1, p0, q*, d0, q0 and = 0. Therefore, in the long run for an individual firm, nothing changes. With perfect competition p = mc: therefor marginal benefits (mb) = mc = p which is called allocative efficiency. Producer"s surplus = the amount producer is paid minus the amount the producer is willing to accept. Claim: in perfect competition, the sum of consumer surplus and producer surplus is maximized. Therefore in this situation 4 + 5 are considered deadweight loss (which is considered a loss to society)

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