Before 1634, tulips, like other flowers, were planted by flower farmers and delivered directly, with little price fluctuation. At the end of 1634, Dutch tulip merchants formed an organization similar to the industrial guild (college), which basically controlled the tulip trading market. The guild stipulates that any tulip business must pay fees to the guild. Each Dutch guilder contract is handed over to the guild at 1/40. The cost of each contract shall not exceed 3 guilders at most. Because these guilds usually trade tulips in pubs, the fees they charge are usually called "drinks". Due to the rising demand for tulips, people are generally optimistic about the trading prospects of tulips and have invested in tulip contracts. The harvest period of tulip bulbs is September every year. At the end of 1636, the Dutch tulip market not only bought and sold tulip bulbs that had been harvested, but also bought and sold bulbs that would be harvested in advance of 1637. After the tulip transaction is relatively concentrated, the information of buyers and sellers circulates rapidly, and the transaction cost is greatly reduced. There are no clear rules in this futures market, and there are no specific constraints on buyers and sellers. Tulip contracts are easy to buy and sell, and they have changed hands several times in a short time. This makes it possible for businessmen to make love and short in the futures market. In the process of changing hands many times, the price of tulips has been rising.