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Explicit cost
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a cost that requires an outlay of money
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Implicit cost
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does not require an outlay of money
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Accounting profit
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equal to revenue minus explicit cost
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Economic profit
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equal to revenue minus the opportunity cost of resources used
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Marginal cost
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producing a good or service is the additional cost incurred by producing one more until of that good or service.
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Marginal benefit
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of a good or service is the additional benefit derived from producing one more until of that good or service
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Principle of marginal analysis
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to determine if the costs associated with the change in activity will result in a benefit that is sufficient enough to offset them
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Sunk cost
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a cost that has already been incurred and is nonrecoverable. Sunk cost should be ignored in decisions about future actions
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Bounded Rationality
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a decision maker operating with bounded rationality makes a choice that is close to but not exactly the one that leas to the best possible economics outcome
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Risk aversion
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the willingness to sacrifice some economic payoff in order to avoid a potential loss
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status quo bias
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the tendency to avoid making a decision and sticking with the status quo
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Principle of diminishing marginal utility
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each successive unit of a good or service consumed adds less to Toal utility than the previous unit
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Optimal consumption rules
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when a consumer maximizes utility, the marginal utility per dollar spent must be the same for all good dns services in the consumption bundle
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Substitution effect
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of a change in the price of a good is the change in the quanitiyu of that good consumed as the consumer substitutes other good that are now relatively cheaper in place of a good that has become relatively more expensive
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Income effect
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a change in the price of a good is the change in the quantity of that good consumed that results form a change in the consumers purchasing power due to the change in the price of the good
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Indifference curve
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a line that shows all the consumption bundles that yield the same amount of total utility for an individual
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Marginal rate of substitution
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of good R in place of good M is equal to MUr/MUm, the ration of the marginal utility of R to the marginal utility of M.
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Fixed input
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an input whose quantity is fixed for a period of time and cannot be varied
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Variable input
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an input whose quantity the firm can very at any time
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long run
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the time period in which all inputs can be varied
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short run
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the time period in which at least one input is fixed
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Long-run average total cost curve
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shows the relationship between output and average total cost when fixed cost has been chosen to minimize average total cost for each level of output
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Decreasing returns to scale
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when long-run average total cost increases as output increases
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constant returns to scale
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when long-run average total cost is constant as output increases
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Perfectly competitive market
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a market in which all market participants are price-takers
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Marginal revenue
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the change in total revenue generated by an additional unit of output
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Optimal output rule
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profit ia maximized by producing the quantity of output at which the marginal revenue of the last unit produced is equal to its marginal cost
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Break-even price
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of a piece-taking firm is the market price at which is earns zero profit
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Shut-down price
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a firm will cease production in the short urn if the market price falls below the shut down price, which is equal to minimum average variable cost
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Short-run market equilibrium
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the quantity supplied equals the quantity demanded, taking the number of producers as given
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Long-run market equilibrium
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when the quantity supplied equals the quantity demanded, given hat sufficient time has elapsed for entry into an exit from the industry to occur