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Market Structures: key terms, formulas and examples

Markets set prices through supply and demand. Structures run from perfect competition to monopoly, and externalities or public goods are where markets alone fall short.

Example

With one bakery in town, it has the power to raise prices.

Takeaway

Ask how many sellers exist and how easily new ones can enter.

Key terms

Supply and demand
The interaction that sets market prices.
Monopoly
One seller controls the whole market.
Oligopoly
A few large firms dominate a market.
Perfect competition
Many sellers offering identical products, so none can set the price.
Externality
A cost or benefit that lands on people outside the deal.
Public good
A good everyone can use and nobody can be excluded from.
Price floor
A legal minimum price.
Natural monopoly
A market best served by one firm because of high costs.
Market equilibrium
The point where supply equals demand.

Formulas

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