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Marginal Product of Labor (MPL)
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MPL = change in Q / change in L
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Average Product of Labor (APL)
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APL=Q/L
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Marginal Product of Capital (MPK)
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MPK=change in Q/change in K
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Average Product of Capital (APK)
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APK=Q/K
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Total Cost
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TC=TVC+TFC
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Average Fixed Cost
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AFC=TFC/Q
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Average Variable Cost
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AVC= TVC/Q
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Average Total Cost (short equation)
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TC/Q or (TFC + TVC)/Q
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Average Total Cost (longer equation)
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ATC=AVC+AFC
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Marginal Cost (longer equation)
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MC=change in TC/change in Q = change in TVC/change in Q
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Marginal Cost (shorter equation)
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MC=W/MPL
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Wage
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change in TVC/change in L
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Profit Equations
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Profit= Price(Quantity)-Total Cost
Profit=(Price- ATC)Quantity
Profit=(Price- ATC)Quantity
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Marginal Revenue
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change in total revenue/change in quantity
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Marginal profit =
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marginal revenue - marginal cost
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At the profit maximizing quantity...
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Marginal revenue = marginal cost (for all firms)
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In pure competition...
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Price = Marginal revenue, due to the price taking assumption
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Because MR=MC and Price=MR at the profit maximizing quantity...
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Price=MC (when P > AVC) in pure competition
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Shutdown condition for short run
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AVC > P
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Equilibrium in the short run
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When QD=QS
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MR-MC =
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Marginal Profit
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Marginal Profit is also = to
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change in profit/ change in Q
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At the profit maximizing quantity, marginal profit =
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zero
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Because MC=P in short run, the firm will shut down if...
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MC < AVC