为什么储蓄等于投资？

在宏观经济中，储蓄和投资是两个重要的概念。许多人认为这两者之间存在因果关系，但事实上，储蓄等于投资。这究竟是为什么呢？

Firstly, we need to understand that the purpose of saving is to accumulate wealth for future use. In other words, when a person saves money, it means that they are storing up resources for future investment or consumption.英文翻译：

Secondly, investment is the process of deploying savings into productive assets such as machinery, buildings, and other forms of capital. When a person invests, they are essentially using their savings to acquire capital that can generate income or increase their productivity.英文翻译：

Thirdly, in a closed economy, the amount of saving is equal to the amount of investment. This is because in an closed ecomony, there is no net inflow of funds from the rest of the world. Therefore, any increase in saving will lead to an equal increase in investment and vice versa.英文翻译：

Finally, in an open economy, the relationship between saving and investment remains the same. However, the net saving of the country will equal the net investment of the rest of the world. This is because a country's saving will be deployed domestically for investment, but any additional saving will be deployed overseas for investment.英文翻译：

In conclusion, savings and investment are not different concepts but rather two sides of the same coin. In any economy, savings will always equal investment because they are two ends of the same process - the conversion of current income into capital for future production and consumption.