One psychological story: cigarettes

First man to buy cigarettes, tobacco 29 yuan, but he did not match, with the clerk said: "By the way it sent a box of matches." Clerk did not give. Second man to buy cigarettes, tobacco 29 yuan, he also did not match, with the clerk said: "cheap dime of it." Finally, he used the hair to buy a box of matches. (Internal gear pump.) This is the simple psychological marginal effect. The first: the owner think they make money in a commodity, the other one did not make money. Money feeling index of 1. The second: the owner that two commodities are making money, making money index of 2. Of course, the psychological tendency to second. Again, this is also reflected in the buy one get one psychological tricks, customers do not think there is one thing to pay, they earned, they are actually psychological marginal effect at play. (Centrifugal oil pump.) Transform a way can often play an unexpected effect! Usually a lot of things in a different approach will be different results. Life on the road, improving mental models and ways of thinking is very important.