Short-Run Costs and Output Decisions. Decisions Facing Firms. Costs in the Short Run. The short run is a period of time for which two conditions hold:
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1 C H A P T E R 7 Short-Run Costs and Output Decisions Prepared by: Fernando Quijano and Yvonn Quijano. How much output to supply. How much of each input to demand DECISIONS Decisions Facing Firms Which production technology to use are based on.. The market price of the output. The prices of inputs INFORMATION The techniues of production that are available. of Costs in the Short Run The short run is a period of time for which two conditions hold:. The firm is operating under a fixed scale (fixed factor) of production, and. Firms can neither enter nor exit an industry. of
2 Costs in the Short Run Fixed cost is any cost that does not depend on the firm s level of output. These costs are incurred even if the firm is producing nothing. There are no fixed costs in the long run. Variable cost is a cost that depends on the level of production chosen. TC TFC TVC = + Total Cost = Total Fixed + Total Variable Cost Cost of Total Fixed Cost (TFC) Total fixed costs (TFC) or overhead refers to the total of all costs that do not change with output, even if output is zero. Another name for fixed costs in the short run is sunk costs is because firms have no choice but to pay for them. of Average Fixed Cost (AFC) Average fixed cost (AFC) is the total fixed cost (TFC) divided by the number of units of output (): AFC = TFC Spreading overhead is the process of dividing total fixed costs by more units of output. Average fixed cost declines as uantity rises. of
3 Short-Run Fixed Cost (Total and Average) of a Hypothetical Firm () () TFC () AFC (TFC/) As output increases, total fixed cost remains constant and average fixed cost declines. 7of Variable Costs The total variable cost curve is a graph that shows the relationship between total variable cost and the level of a firm s output. The total variable cost is derived from production reuirements and input prices. of Derivation of Total Variable Cost Schedule from Technology and Factor Prices PRODUCT Units of output USING TECHNIQUE Units of A output B Units of output A B A B UNITS OF INPUT REQUIRED (PRODUCTION FUNCTION) The total variable cost curve shows the cost of production using the best available techniue at each output level, given current factor prices. K 7 9 L TOTAL VARIABLE COST ASSUMING P K =, P L = TVC = (K x P K ) + (L x P L ) ( x ) + ( x ) + (7 x ) + ( x ) + (9 x ) + ( x ) + ( x ) = ( x ) = ( x ) = ( x ) = ( x ) = ( x ) = 9of
4 Marginal Cost (MC) Marginal cost (MC) is the increase in total cost that results from producing one more unit of output. Marginal cost reflects changes in variable costs. TOTAL VARIABLE COSTS UNITS OF OUTPUT () MARGINAL COSTS () of The Shape of the Marginal Cost Curve in the Short Run In the short run every firm is constrained by some fixed input that:. leads to diminishing returns to variable inputs, and. limits its capacity to produce. of Graphing Total Variable Costs and Marginal Costs Total variable cost always increases with output. The marginal cost curve shows how total variable cost changes. of
5 Average Variable Cost (AVC) Average variable cost (AVC) is the total variable cost divided by the number of units of output. AVC = TVC Marginal cost is the cost of one additional unit, while average variable cost is the variable cost per unit of all the units being produced. of () () TVC, () MC ( TVC) Short-Run Costs of a Hypothetical Firm () AVC (TVC/) 9, 9. () TFC () TC (TVC + TFC),,,,, (7) AFC (TFC/) () ATC (TC/ or AFC + AVC), 9. of Graphing Average Variable Costs and Marginal Costs At units of output, AVC is minimum and eual to MC. When marginal cost is below average cost, average cost is declining. When marginal cost is above average cost, average cost is increasing. Marginal cost intersects average variable cost at the lowest, or minimum, point of AVC. of
6 Total Costs TC = TFC + TVC Adding the same amount of total fixed cost to every level of total variable cost yields total cost. For this reason, the total cost curve has the same shape as the total variable cost curve; it is simply higher by an amount eual to TFC. of Average Total Cost Average total cost (ATC) is total cost divided by the number of units of output (). ATC = AFC + AVC ATC TC TFC = = + TVC Because AFC falls with output, an ever-declining amount is added to AVC. 7 of The Relationship Between Average Total Cost and Marginal Cost If MC is below ATC, then ATC will decline toward marginal cost. If MC is above ATC, ATC will increase. MC intersects the ATC and AVC curves at their minimum points. of
7 Output Decisions: Revenues, Costs, and Profit Maximization The perfectly competitive firm faces a perfectly elastic demand curve for its product. 9 of Total Revenue (TR) and Marginal Revenue (MR) Total revenue (TR) is the total amount that a firm takes in from the sale of its output. TR P = Marginal revenue (MR) is the additional revenue that a firm takes in when it increases output by one additional unit. In perfect competition, P = MR. of Comparing Costs and Revenues to Maximize Profit The profit-maximizing level of output for all firms is the output level where MR = MC. In perfect competition, MR = P, therefore, the firm will produce up to the point where the price of its output is just eual to shortrun marginal cost. The key idea here is that firms will produce as long as marginal revenue exceeds marginal cost. of
8 Comparing Costs and Revenues to Maximize Profit The profit-maximizing output is *, the point at which P* = MC. of () Profit Analysis for a Simple Firm () TFC () TVC () MC () P = MR () TR (P x ) 7 9 (7) TC (TFC + TVC) 9 () PROFIT (TR TC) - - of The Short-Run Supply Curve At any market price, the marginal cost curve shows the output level that maximizes profit. Thus, the marginal cost curve of a perfectly competitive profit-maximizing firm is the firm s short-run supply curve. of
9 Review Terms and Concepts average fixed cost (AFC( AFC) average total cost (ATC) average variable cost (AVC( AVC) fixed cost marginal cost (MC( MC) marginal revenue (MR( MR) spreading overhead sunk costs total cost (TC( TC) total fixed cost (TFC( TFC) total revenue (TR( TR) total variable cost (TVC( TVC) total variable cost curve variable cost of
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