请帮我翻译这段英文，是关于经济学的。

Trade-off represents the choices we have ti make and the relations between the alternatives.

Microeconomics describes the trabe-offs that consumers,workes,and firms face,and shows how these trade-offs are best made.Small scale,partial.

Macroeconomics describes the aggregate issues. It is large scale,and general.The trade-offs a country or economy faces,and how these trade-offs are best made.

A market is the collection of buyers and sellers that,through their actual or potential interactions,determine the price of a product or set of products.

The extent of a market:the boundaries,both geographically and in terms of products range.

five types of market:
Pure monopoly is when there is only one palyer in a market.------price maker.

duopoly is when there are twoplayers in a market.

Oligopoly is when there are about 3-7 palyers in a market.

Monopolistic competition is the most common type of market.

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