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1. PERFECT COMPETITION
2. MONOPOLY
3. OLIGOPOLY
4. MONOPOLISTIC COMPETITION

price takers- no control over the market price

commodities- it's the same good no matter who makes it

total control over prices

low to no barriers to enter

many close substitutes for their good

top 4 companies control 70-80% of market

unique (one of a kind) good

high barriers to enter and compete (start-up costs/technology)

barriers are too high becuase of patents & copyrights

few firms

uses non-price competition to try and raise price

many firms/producers

similar goods

barriers are low- easier to start a business and compete

only producer-no substitutes for their good