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industrial organization
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the study of how firms' decisions about prices and quantities depend on the market conditions they face
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goal of a firm
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maximize profit
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total revenue
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Price x Quantity (amount a firm receives for the sale of its output)
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total cost
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fixed costs plus variable costs (market value of the inputs a firm uses in production); explicit + implicit
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profit
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TR-TC
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explicit costs
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input costs that require an outlay of money by the firm
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implicit costs
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opportunity costs
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economic profit
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TR - explicit - implicit
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accounting profit
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TR - explicit
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production function
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the relationship between quantity of inputs used to make a good and the quantity of output of that good
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marginal product
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the increase in output that arises from an additional unit of input
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diminishing marginal product
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the property whereby the marginal product of an input declines as the quantity of the input increases
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fixed cost
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Costs that do not vary with the quantity of output produced; even is firm produces nothing, these costs still occur (rent)
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variable cost
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a cost that varies with changes in the level of output; paper cups for coffee
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average total cost
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TC/Q or AFC + AVC
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average fixed cost
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FC/Q
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average variable costt
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VC/Q
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marginal cost
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change in TC/change in Q
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efficient scale
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the quantity that minimizes ATC
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ATC falling
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MC < ATC
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ATC rising
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MC > ATC
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economies of scale
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the property whereby long-run average total cost falls as the quantity of output increases
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diseconomies of scale
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the property whereby long-run average total cost rises as the quantity of output increases
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profit maximization rules
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1. Marginal Revenue > Marginal Cost= Increase in Output (Q)
2.Marginal Revenue<Marginal Cost= Decrease in Output (Q)
3. Marginal Revenue=Marginal Cost = Profit Max Output (Q)
2.Marginal Revenue<Marginal Cost= Decrease in Output (Q)
3. Marginal Revenue=Marginal Cost = Profit Max Output (Q)
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shutdown rule (short run)
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P<AVC
TR/Q < VC/Q
TR < VC
TR/Q < VC/Q
TR < VC
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sunk cost
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a cost that has already been committed and cannot be recovered
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exit rule (long run)
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TR/Q < VC/Q
P<ATC
P<ATC