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production function
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the way in which a firm combines inputs (labor, capital, raw materials, land, etc.) to produce an output
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variable inputs
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those inputs that can be changed in the short run to change production (typically, labor and certain materials/supplies)
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fixed inputs
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those inputs that cannot be changed in the short run to change production (typically, physical capital)
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plant capacity
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maximum potential level of production; depends on amount of physical capital
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short run
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the period of time too short for a firm to alter its plant capacity; the period of time during which there are fixed inputs
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long run
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a period of time long enough for a firm to alter all of its inputs, so all inputs become variable; plant capacity can be changed
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marginal product of labor (MPL)
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how much extra output is made when one more worker is added
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fixed cost (FC)
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a cost that doesn't change as output changes, a cost associated with the mere existence of a business, a cost that must be paid even when the firm's output is zero
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variable cost (VC)
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a cost that changes as output changes
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total cost (TC)
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the sum of fixed costs and variable costs
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increasing returns to scale
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output is increasing at a faster rate than all inputs (ex: inputs double --> outputs triple)
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decreasing returns to scale
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output is increasing at a slower rate than all inputs (ex: inputs double --> output increases by 50%)
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constant returns to scale
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output is increasing at the same rate as all inputs (ex: input doubles --> outputs double)
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explicit costs (accounting costs)
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costs that involve actually spending money (ex: rent, transportation, loans, payments, salaries, supplies, legal fees, etc.)
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implicit costs (economic costs)
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costs that don't involve paying money but rather are measured by the value of what is given up
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depreciation
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loss in value of physical capital due to wear and tear over time treated like an explicit cost
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normal profit
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business owner is no better off an and no worse off than their next best alternative (when economic profit = 0)
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P
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price
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TP
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total product (quantity of output)
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MP
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marginal product
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pi symbol
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profit
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perfect competition characteristics
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- many firms in a market
- they produce standardized (identical) products
- free entry and exit in a perfectly competitive market
- they produce standardized (identical) products
- free entry and exit in a perfectly competitive market
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positive economic profit
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you are doing better than you would be in your next best alternative
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negative economic profit
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you are doing worse than you would be in your next best alternative
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normal profit (zero economic profit)
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you are doing no better an no worse than you would be in your next best alternative