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Slope
answer
Change in price over change in quantity
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Cross Price Elasticity
answer
% Change in Quantity Demanded of a good A given a percentage change in Price of good B
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Price Elasticity of Supply
answer
% change in quantity supplied/ % change in price
Perfectly Inelastic=0
Inelastic <1
Unit Elastic=1
Elastic >1
Perfectly Elastic is infinity
**Time is most important factor for determining price elasticity of supply
Perfectly Inelastic=0
Inelastic <1
Unit Elastic=1
Elastic >1
Perfectly Elastic is infinity
**Time is most important factor for determining price elasticity of supply
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A movement from A to B
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Shift in quantity demanded. Only change is the price of the good.
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A movement from D1 to D2
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Shift in demand. Increase: Shifts to right
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Total Cost
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Cost of all the inputs a firm uses in production
TC=wL + rK
W is the wage per unit labor
R is the per unit rental rate of capital
Avg. Total Cost x Quantity
Fixed Cost + Variable Cost
TC=wL + rK
W is the wage per unit labor
R is the per unit rental rate of capital
Avg. Total Cost x Quantity
Fixed Cost + Variable Cost
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Profit
answer
Total Revenue-Total Cost
(Price-Avg. Total Cost) x Quantity
(Price-Avg. Total Cost) x Quantity
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Total Revenue
answer
Price x Quantity
Amount of funds received by a seller of a good/service
Maximized at equilibrium
Amount of funds received by a seller of a good/service
Maximized at equilibrium
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variable costs
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costs that change as output changes
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Avg. Revenue
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Total Revenue/Quantity
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Marginal Revenue
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Change in Total Revenue/Change in Quantity
(PRICE)
(PRICE)
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Elasticity
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Percentage change in A/Percentage change in B
A is quantity demanded. B is price.
A is quantity demanded. B is price.
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Income Elasticity of Demand
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% change in Quantity Demanded/ % change in in income
Greater than 0=normal
Less than 0=inferior
>1=luxury
<1=necessity
Greater than 0=normal
Less than 0=inferior
>1=luxury
<1=necessity
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Key determinants of price elasticity of demand
answer
Availability of close substitutes, passage of time, necessities vs. luxuries, def. of a market, share of good in consumers budget
**Availability of close substitutes: most important
**Availability of close substitutes: most important
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Price elasticity of demand
answer
% change in quantity demanded/% change in price
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Elastic Demand
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When % change in the quantity demanded is GREATER than the % change in price (greater than 1 in abs. value)
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Inelastic Demand
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When % change in quantity demanded is LESS than % change in price (less than 1 in abs. value)
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Unit Elastic Demand
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When % change in quantity demanded is EQUAL to the % change in price (equal to 1 in abs. value)
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Perfectly Inelastic Demand
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Where quantity demanded is completely unresponsive to price and price elasticity of demand equals zero
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Perfectly Elastic Demand
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Where quantity demanded is infinitely responsive to price and price elasticity of demand equals infinity
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Passage of time
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more time that passes, more elastic the demand for a product becomes
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Availability of close substitutes
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If a product has more substitutes available, it will have more elastic demand. If a product has fewer substitutes available, it will have less elastic demand
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Luxuries vs. Necessities
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The demand curve for a luxury is more elastic than the demand curve for a necessity
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Def. of a market
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more narrowly we define a market, the more elastic the demand will be
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Share of a good in a consumer's budget
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the demand for a good will be more elastic the larger the share of the good in the avg. consumer's budget
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Utility
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enjoyment or satisfaction people receive from consuming goods and services
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Marginal Utility
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change in total utility a person receives from consuming one additional unit of a good or service
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Law of diminishing marginal utility
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the principle that consumers experience diminishing additional satisfaction as they consume more of a good or service during a given period of time
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Budget constraint
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limited amount of income available to consumers to spend on goods and services
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Income Effect
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change in quantity demanded of a good that results from the effect of a change in price on consumer purchasing power, holding all other factors constant
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substitution effect
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change in quantity demanded of a good that results from a change in price making the good more or less expensive relative to other goods, holding constant the effect of the price change on consumer purchasing power
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network externalities
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situation in which the usefulness of a product increases with the number of consumers who use it
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opportunity cost
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highest valued alternative that must be given up to engage in an activity
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endowment effect
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tendency of people to be unwilling to sell a good they already own even if they are offered a price that is greater than the price they would be willing to pay to buy the good if they didn't already own it
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sunk cost
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a cost that has already been paid and cannot be recovered
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technological change
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a change in the ability of a firm to produce a given level of output with a given quantity of inputs
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technology
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processes a firm uses to turn inputs into outputs of goods and services
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short run
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period of time during which at least one of a firms inputs is fixed
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long run
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period of time in which a firm can vary all its inputs, adopt new technology and increase or decrease the size of the physical plant
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fixed costs
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costs that remain constant as output changes
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explicit costs
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a cost that involves spending money
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implicit cost
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a nonmonetary opportunity cost
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avg. total cost
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total cost/quantity of output produced
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production function
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relationship btwn the inputs employed by a firm and the max output it can produce with those inputs
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marginal product of labor
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additional output a firm produces as a result of hiring one more worker
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law of diminishing returns
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principle that as some point adding more of a variable input to the same amount of fixed input will cause the marginal product of the variable input to decline
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avg. product of labor
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total output produced by a firm divided by the quantity of workers
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marginal cost
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the change in a firm's total cost from producing one more unit of a good or service
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avg. fixed cost
answer
fixed cost/quantity of output produced
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avg. variable cost
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variable cost/quantity of output produced
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long run avg. cost curve
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curve that shows the lowest cost at which the firm is able to produce a given quantity of output in the long run when no inputs are fixed
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economies of scale
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situation when a firm's LRAC fall as it increases the quantity of output it produces
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constant returns to scale
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a firm's LRAC remains unchanged as it increases output
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minimum efficient scale
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level of output at which all economies of scale are exhausted
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diseconomies of scale
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firm's LRAC rises as the firm increases output
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perfectly competitive market
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a market that meets the conditions of many buyers and sellers, all firms selling identical products and no barriers to new firms entering the market
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price takers
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a buyer or seller that is unable to affect the market price