How is GDP created?

There is a joke that two economists went for a walk in the wild and met a lump of shit. A tells B that you have eaten this shit, and I will give it to you 1 10,000. B was annoyed, but thought it was a good deal and ate it. A didn't expect B to really eat it, so he had to keep his promise. After walking for a while, I met another piece of shit, and B was going to take revenge. Party A was heartbroken at the loss of 6,543.8+0,000, and gladly took it. So B returned 1 10,000 to A. At this time, the two of them suddenly realized that we didn't get anything, but we ate two pieces of shit for nothing. Hearing this, their tutor smiled and said: You have easily created 2 million GDP. It seems that I have to revise the forecast of GDP growth this year. This is from "Big Technology * New Humanity" with the title "Two Serious Shit". This paper makes an economic analysis of this problem and draws the conclusion that they have created a GDP of 654.38+0 million. The article said that if we admit that singers create GDP by singing, we should also admit that these two people also create GDP by eating shit. I still have some questions about how singers can create GDP by singing. Does it mean that some people sell goods and some people buy them? With these transaction figures, there will be GDP? Satisfactory answer the calculation method of four-leaf clover happiness level 3 2008-08-03GDP

At present, three calculation methods are usually used: output method, income method and expenditure method.

1. Mode of production: GDP = ∑ Total output of various industrial sectors-consumption among various industrial sectors ∑.

2. Income method: GDP = ∑ remuneration of workers in various industrial sectors+∑ depreciation of fixed assets in various industrial sectors+∑ net product tax in various industrial sectors+∑ operating profit in various industrial sectors.