Two people sell sesame cakes, each selling 20 per day (because the total demand for sesame cakes is only 40), with a price of one yuan per cake, and a daily output value of 40 yuan. Later, the two people discussed and exchanged 100 cakes with each other (A bought 100 cakes from B, and B bought 100 cakes from A). In the form of bookkeeping, the price remained unchanged, and the transaction volume became 240 yuan per day. 一一Virtual economy is generated

If the price of the sesame cakes exchanged is 5 yuan, the transaction volume is 1040 yuan per day. At this time, A and B raised the market price of sesame cakes to 2 yuan. Some people heard that sesame cakes were selling for 5 yuan per cake, and when they saw that the market price of sesame cakes was only 2 yuan, they quickly bought them. 一一Bubble economy is generated

If sesame cakes cannot be made all at once, they buy forward cakes. On the one hand, A and B increase the production of sesame cakes (up to 100 or more per day), on the other hand, they sell forward sesame cakes and start trading in sesame cake bonds. Buyers can buy them with cash or mortgage loans. One by one, financing, financial intervention

Some people want to buy, but they have neither cash nor collateral, so A and B issue subprime sesame cake bonds. And they buy insurance from insurance institutions.

-Subprime bonds sow the seeds for the subprime mortgage crisis

One day, it is found that the sesame cakes purchased cannot be eaten, and they need space to store and will get moldy, so they sell them quickly, even if the price is lower. -One bubble bursts

The financial crisis broke out. The sesame cake shop laid off employees (only 40 sesame cakes a day are enough)--one unemployment; sesame cake bonds became waste paper. -One mortgage crisis

Mortgage loans (collateral is worthless) cannot be recovered, lending banks have liquidity crises, and insurance companies face bankruptcy, etc.