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A to buy cigarettes, tobacco 29 yuan, but he did not match with the clerk said: "By the way to send a box of matches it." Clerk did not give.
B to buy cigarettes, RS Gold cigarettes 29 yuan, he also did not match with the clerk said: "The cheaper one hair now." Finally, he used this hair to buy a box of matches.

This is the most 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 the two commodities are making money, make WOW Gold money index of 2. Of course, the second a psychological tendency. Again, this is also reflected in the buy one get one psychological trick, the customer that there is one thing not to pay, they earn, they are actually psychological marginal effect at Runescape Gold play.

Transform a way can often play an unexpected effect! Usually a lot of things in a different way the results will be different. Life on the road, improving mental models and ways of thinking is very important.