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Microecon
Def. for Final
33
Economics
Undergraduate 1
12/17/2007

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Term
shortage
Definition
An excess of quantity demanded over quantity supplied.
Term
surplus
Definition
an excess of quantity supplied over quantity demanded
Term
Price floor
Definition
a legal minimum below which the price charged for a commodity is not permitted to fall
Term
price ceiling
Definition
a legal maximum above which the price charged for a commodity is not permitted to rise
Term
First Welfare Theorem
Definition
In a perfect competitive economy (with no externalities) the equilibrium is efficient.
Term
Perfectly competitive economy
Definition
  • large number of buyers and sellers
  • no externalities
  • homogenous products
  • perfect information
Term
Consumer surplus
Definition
is the difference between the reservation price (how much you're willing to pay) and the market price.
Term
total consumer surplus
Definition
area limited by the D curve and the market price line
Term
Producer surplus of a seler
Definition
the difference between the market price and her prdouction cost.
Term
Total producer surplus
Definition
the area limited by the S curve and the market price line
Term
Total Surplus
Definition
Consumer surplus + producer surplus + government surplus
Term
Externality
Definition
An externality occurs when an individual does not bear the full benefit/cost of their actions.
Term
Marginal Private Benefit
Definition
is the share of an activity's marginal benefit that is received by the people who can carry out the activity
Term
Marginal Social Benefit
Definition
is the sum of MPB plus its incidental benefits that are received by others and for which those others don't pay.
Term
MSB (formula)
Definition
MPB + externality
Term
Marginal Private Cost
Definition
the slope of an activity's marginal cost that is paid by the persons who carry out the activity
Term
Marginal Social Benefit
Definition
is the sum of MPC plus its incidental costs that are borne by others who realize no compensation for the resulting usage to their will being.
Term
MSC (formula)
Definition
MPC + extern.
Term
fixed cost
Definition
the cost of an input whose quantity does not rise when output goes up
Term
variable cost
Definition
a cost whose total amount changes when the quantity of output of the supplier changes
Term
average cost
Definition
the total cost divided by the quantity produced
Term
marginal cost
Definition
the increase in total cost that arises from the production of an additional unit
Term
short-run
Definition
you must incur the fixed cost even if you do not produce
Term
long-run
Definition
all costs are variable
Term
total cost
Definition
fixed cost plus the total variable cost
Term

Formulas for Costs

TC                               AVC

AC 

Definition

 

FC + TVC                   TVC/Q

TC/Q                         ▲TVC

▲ TC 

 

 

Term
total product
Definition
is the total output produced given same inputs
Term
average product
Definition
the total product divided by the number of units used of a single input
Term
marginal product is the increase of total product obtained as a result of increasing that input in one unit, taking as given the remaining inputs quantities
Definition
Term
the law of diminishing marginal returns
Definition
states that the marginal product of one additional unit of the input decreases as the number of units increases
Term
Total profit
Definition
the amount of money a firm receives from selling its product (total revenue) minus the amount it must pend to make and market the good (total cost)
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