One of the main basic models taught in economics is the circular-flow model, which describes the flow of money and products throughout the economy in a very simplified way.



The model represents all of the actors in an economy as either households or firms (companies), and it divides markets into two categories:

Markets for goods and services

Markets for factors of production (factor markets)

Remember, a market is just a place where buyers and sellers come together to generate economic activity.


Goods and Services Markets

In goods and services markets, households buy finished products from firms that are looking to sell what they make.

In this transaction, money flows from households to firms, and this is represented by the direction of the arrows on the lines labeled $$$$ that are connected to the Goods and Services Markets box.

Note that money, by definition, flows from buyer to seller in all markets.

On the other hand, finished products flow from firms to households in goods and services markets, and this is represented by the direction of the arrows on the Finished product lines.
另一方面,制作好的商品在商品与服务市场中从公司流向家庭,它由标有“Finished product”的箭头表示。

The fact that the arrows on the money lines and the arrows on the product lines go in opposite directions simply represents the fact that market participants always exchange money for other stuff.


Markets for the Factors of Production

If markets for goods and services were the only markets available, firms would eventually have all of the money in an economy, households would have all of the finished products, and economic activity would stop.

Luckily, the goods and services markets don’t tell the whole story, and factor markets serve to complete the circular flow of money and resources.

The term factors of production refers to anything that is used by a firm in order to make a final product.

Some examples of factors of production are labor (the work was done by people), capital (the machines used to makes products), land, and so on.

Labor markets are the most commonly discussed form of a factor market, but it’s important to remember that factors of production can take many forms.

In factor markets, households and firms play different roles than they do in the markets for goods and services.

When households provide (i.e. supply) labor to firms, they can be thought of as the sellers of their time or work product.

(Technically, employees can more accurately be thought of as being rented rather than being sold, but this is usually an unnecessary distinction.)

Therefore, the functions of households and firms are reversed in factor markets as compared to in goods and services markets.

Households provide labor, capital, and other factors of production to firms, and this is represented by the direction of the arrows on the Labor, capital, land, etc. lines on the diagram above.

In the other side of the exchange, firms provide money to households as compensation for the use of factors of production, and this is represented by the direction of the arrows on the SSSS lines that connect to the Factor Markets box.
在交易的另一端,公司向家庭提供金钱以偿付生产要素,这由连接到“Factor Markets”方框的那条标有“SSSS”的箭头表示。


The Two Types of Markets Form a Closed Loop

When factor markets are put together with goods and services markets, a closed loop for the flow of money is formed.

As a result, continued economic activity is sustainable in the long run, since neither firms nor households are going to end up with all of the money.

The outer lines on the diagram (the lines labeled Labor, capital, land, etc. and Finished product) also form a closed loop, and this loop represents the fact that firms use factors of production to create finished products and households consume finished products in order to maintain their ability to provide factors of production.