The protruding part in the middle of the normal curve is the "head", and the part that is relatively flat on both sides is called the "tail". Most people's needs will be concentrated in the "head" part, and the needs distributed in the "tail" part are personalized and scattered. A small amount. But this part is differentiated, a small amount of demand will form a long "tail" on the demand curve. The so-called long tail effect means that all the markets distributed in the "tail" will form a sum A market larger than the "head" market, emphasizing "personalization" and "small profit large market", is to make little money for everyone, but to make money for many people. According to the above definition, the following are consistent with the long tail effect:. ['Xiao Ji opened an online bookstore in charge of book sales. Craftsmen can also sell their own handmade bookmarks here. Bookmarks are cheap but popular, and the sales actually exceed the sales of books.', 'With the rise of online book sales, Xiao Zhang changed the physical bookstore to a "book bar" and no longer sells books. After some time, he found that the daily sales of coffee and refreshments were higher than the original book sales.', 'Many "white-collar workers" want to drink coffee during work but have no time to buy it. Xiao Wang founded a coffee delivery website and bought coffee at the coffee shop and delivered it to the customer who placed the order. Although the service fee is only 2 yuan per cup, the website income not bad.', "Xiao Liu's e-commerce website originally used to sell and distribute small appliances. Later, they expanded their main business and distributed magazines and flowers. After a period of time, the orders and revenue of magazines and flowers gradually exceeded the distribution of home appliances."]