ECON 1000 Chapter Notes - Chapter 12: Perfect Competition, Marginal Revenue, Demand Curve
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ECON 1000 Full Course Notes
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In perfect competition, ar = mr = p. In the short run, firm decides what quantity to produce or to shut down: economic profit max at quantity where mr = mc: If mr > mc, firm increases q to increase economic profit. If mr < mc, firm decreases q to increase economic profit: economic loss = tfc + (avc p) x q, but if firm shuts down: economic loss=tfc, for firm incurring economic loss: If p > avc, firm maxes profit by continuing to produce. If p < avc, firm will temporarily shut down: shutdown point at min avc, perfe(cid:272)tly (cid:272)o(cid:373)petitive fir(cid:373)"s supply (cid:272)urve is its mc curve above min avc. Output, price, and profit in the short run. Short-run industry supply curve is horizontal sum of individual firm supply curves. In the short run, the number of firms and their plant size are fixed. Output, price and profit in the long run.