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Econ test 3
perfect competition & monopolies
43
Economics
Undergraduate 1
04/02/2012

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Term
2 facts consumers face
Definition
1) limited funds or resources to spend
2) you must pay a price to obtain a good or service
Term
budget constraint
Definition
all the different combinations of goods and services a consumer can purchase given a specific income level and prices of those goods and services
Term
changes in budget constraint
Definition
1) changes in income
2)changes in prices of the goods
Term
utility
Definition
satisfaction derived from consumption of a good or service (measured in units)
Term
marginal utility
Definition
the additional utility gained from consumption of an additional unit
Term
rational spending rule
Definition
spending should be allocated across goods so that the MU per $ is the same for each good
Term
two types of taxes
Definition
1)per unit tax
2) ad-valorem tax (%of price)
Term
tax burden
Definition
who's paying what fraction or portion of the tax
Term
subsidies
Definition
want to increase trade (Reverse tax)
Term
tax revenue formula
Definition
(Tax) x (Qbar-- amount of units)
Term
perfectly competitive market
Definition
a market in which no buyer or seller has any influence over the market price
Term
price takers
Definition
takes marker price as given
Term
market characteristics
Definition
1)standardized or homogeneous product
2)each buyer and seller is going to constitute a minimal fraction of the market
3)free entry and exit into the market (no barriers)
4)buyers and sellers are well informed (perfect information)
Term
short run
Definition
some period "sufficiently short" in which at least one of the firm's factors of production is fixed
Term
factors of production
Definition
all the inputs used to produce a good
Term
long run
Definition
period of time where all factors of production are variable
Term
fixed costs
Definition
sum of all costs involved in production of a good.... these are the same, regardless
Term
variable costs
Definition
sum of all variable costs involved in production
Term
variable costs
Definition
change with the level of production
Term
total costs
Definition
FC + VC =
Term
profit
Definition
revenue-cost=
Term
profit maximization
Definition
MC=MR
Term
zero
Definition
in the long run in a perfectly competitive market, there are ____ profits
Term
3 assumptions built on monopoly theory
Definition
1) single seller (can't buy from anyone else)
2) no close substitutes
3) extremely high barriers to entry
Term
barriers to entry
Definition
1) legal barriers
2) patents
3) licenses
4) economies of scale
5) exclusive ownership of a necessary resource
Term
natural monopoly
Definition
extremely pronounced economies of scale
Term
price searcher
Definition
power to set their own price above MC=MR
Term
price discrimination
Definition
charging different prices to different consumers for same product absent of cost differences
Term
monopolies
Definition
1) start where MC=MR
2) Q* (find the respective quantity)
3) find consumers maximum willingness to pay
Term
monopolistic competition
Definition
market structure between perfect competition and a pure monopoly
Term
monopolistic theory based on 3 assumptions
Definition
1) many buyers and sellers
2) heterogeneous (or differentiated products)
3) easy entry and exit in the industry
Term
oligopoly
Definition
1) dominated by a small number of firms
2) can be an identical or differentiated product
3) high barriers to entry
Term
basic elements of a game
Definition
1) players
2) all possible strategies
3) set of payoffs
Term
strategic interdependence
Definition
your best action depends on others actions and their best action depends on your play
Term
pay off matrix
Definition
defines all possible strategies and the payoffs of the strategies
Term
dominant strategy
Definition
best choice regardless of your rivals choice (you play same move no matter what)
Term
dominated strategy
Definition
a move you NEVER play
Term
nash equilibrium
Definition
any combination of strategies, in which each players strategy is his best response, given the other players choices
Term
prisoners dilemma
Definition
a game where each player has a dominant strategy and when each plays it, the resulting payoff is smaller than if each had played a dominated strategy
Term
tit for tat
Definition
a repeated prisoners dilemma game where players cooperate on the first move and mimic their partners last move on each successive play
Term
dynamic games
Definition
1)still have complete information
2)play unfolds over a period of time
3)players can react to prior moves
Term
decision tree
Definition
describes possible moves in a game of sequence that correspond to each possible combination of strategies
Term
credible threat
Definition
a threat to take an action that is in the threateners (promisers) interest to carry out
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