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Micro Test 3
micro
19
Economics
Undergraduate 3
04/10/2012

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Term
When do we have a natural monopoly?
Definition
When the LAC curve is declining throughout. This makes it cheapest for a single firm to serve the entire industry.
Term
optimality condition for a monopolist
Definition
MR = MC
Term
arbitrage
Definition
the purchase of something for costless risk-free resale at a higher price.
Term
X-inefficiency
Definition
a condition in which a firm fails to obtain maximum output from a given combination of inputs.
Term
Pivotal difference between monopolists and perfect competitors:
Definition
MR < P for monopolists.
MR = P for perfect competitor.
Term
dominant strategy
Definition
the strategy in a game that produces better results irrespective of the strategy chosen by one's opponent.
Term
Nash equilibrium
Definition
One or both players has a dominant strategy. If it's one, the other will choose accordingly, if its both, each will choose their dominant.
Term
maximin strategy
Definition
Pick whichever option has the highest minimum payoff.
Term
Cournot
Definition
Each firm assumes that its rivals will continue producing at current levels. P = (a-bQ2)-bQ1, MR = (a-bQ2)-2bQ1. So profit maximizing Q1 = [(a-bQ2)-MC]/2b
Term
reaction function
Definition
a curve that tells the profit-maximizing level of output for one oligopolist for each amount supplied by another.
Term
Stackelberg Model
Definition
One firm knows the other is a Cournot duopolist.
P = (a-b[Q2 reaction function]) - bQ1
Simplify, then get MR by doubling slope.
Set MR = MC and get Q1
Plug Q1 into Q2 reaction function to get
Term
Bertrand
Definition
I assume that my opponent will maintain his price. Price is set equal to MC so there are zero profits. Both produce the same amount and sell it for the same price. The same as perfect competition.
Term
Shared Monopoly
Definition
Treat it like its a one firm monopoly but then split up output evenly among however many firms there are.
Term
Chamberlin Model
Definition
DD - what happens when all firms change price together.
dd - the demand curve that a firm will face if it alone changes price.
Term
Value of marginal product
Definition
the value, at current market price, of the extra output produced by an additional unit of input.
VMP = MR*MPL
Term
Marginal Revenue Product
Definition
the amount by which total revenue increases with the employment of an additional unit of input.
Term
average factor cost
Definition
another name for the supply curve for an input
Term
total factor cost
Definition
the product of the employment level of an input and its average factor cost.
Term
marginal factor cost
Definition
the amount by which total factor cost changes with the employment of an additional unit of input.
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