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Econ Exam 3
Elasticity to CS and PS
25
Economics
Undergraduate 1
03/29/2011

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Term
Elasticity
Definition
the sensitivity between two variables. occurs when a change in price results in a change in quantity demanded.
Term
Point Elasticity
Definition
the slope is the same throughout the whole line but elasticity varies. 1/slope * P/Q is the formula.
Term
Total Revenue
Definition
can be drawn as a rectangle on the dmd curve, hight is P and width is the quantity sld by fims and purchased by consumers.
Term
Elastic price elasticity of demand
Definition
represented by the upper left of the demand curve, indicates that to increase revenue you must sell more at a lower price
Term
Inelastic price elasticity of demand
Definition
represented by the lower right of the dmd curve, to increase revenue one should sell less at a higher price
Term
Unit Elastic price elasticity of dmd
Definition
repped by the midpoint: revenue is maxed and cannot be increased
Term
Elastic/ sensitive demand determinants
Definition
many substitutes
Term
inelastic/ non sensitive dmd determinant
Definition
no substitutes for the product
Term
Second Law of Demand
Definition
the demand becomes more responsive to price changes over time
Term
Exise taxes
Definition
If the govt raises a tax on a specific good:results in an increase of a firm's costs and an increase in consumer's price. They increase revenue on an inelastic good (cigarettes)
Term
Long Run
Definition
supply is elastic and to suppy more, for example, you can build new buildings
Term
Short Run
Definition
Supply is inelastic, and to supply more, for example, you need more labor which is expensive
Term
Income Elasticity of Demand
Definition
relative change in demand in response to changes in income (horizontal shift)--- formula= %change in Qd/ %change in I
Term
Inelasticity of dmd for a normal good
Definition
EI is a positive number
Term
Inelasticity of Dmd for an inferior good
Definition
EI is a negative number
Term
Cross- price elasticity of demand
Definition
the relative change of Qd as a response to a change in the price of another good. EXY= %change in QdX/ %change in PY (change at a given price of X)
Term
Utility
Definition
the satisfaction we get from consuming a good/service.
Term
Marginal Utility
Definition
the additional satisfaction one gets from consumption
Term
Total Utility
Definition
the additional satisfaction one gets by consuming one more unit of a good (decreases as one consumes more)
Term
Happiness/ MU
Definition
maximized when MUx=MUy assuming that 2 goods are the same price
Term
Fixed Costs
Definition
don't change without varying output such as rent or insurance-- we pay insurance on our car whether we drive it or not
Term
Variable Costs
Definition
vary based on output: wages paid to workers or cost of materials may vary
Term
Total costs
Definition
the sum of fixed and variable costs
Term
Average total costs
Definition
the total costs divided by the number of units produced, giving us the average cost per unit
Term
Marginal Cost
Definition
the change in total costs with an increase in output, giving us the additional cost per additional output. "If we add one more output, what are the additional costs?"
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