1949, an air force captain engineer named Murphy thought one of his colleagues was unlucky and made a casual joke: "If something is likely to be screwed up, let him do it, and things will be screwed up." This sentence spread quickly and spread all over the world. In the process of communication, this joke gradually lost its original limitations and evolved into various forms. One of the most common ones is that "if something bad can happen, no matter how likely it is, it will always happen and cause the greatest possible loss."

Second, the 28 rule

1897, the Italian economist Pareto found that 80% of social wealth is concentrated in the hands of 20% of people, and 80% of people only own 20% of social wealth, which is the "28 law". The "28 rule" reflects an imbalance, but it is ubiquitous in society, economy and life. Attachment: broken window theory, etc

Third, Matthew effect.

Fourth, the watch theorem

Five, the barrel law

Six, the 250 Law The famous American salesman Rude summed up the "250 Law" in commercial warfare. He believes that there are roughly 250 relatives and friends behind every customer. Winning the favor of a customer means winning the favor of 250 people; On the contrary, if you offend one customer, it means that you have offended 250 customers. This law strongly proves the true meaning of "customer is God". From this, we can get the following enlightenment: we must take everyone around us seriously, because behind everyone, there is a relatively stable and huge group.

7. The most intuitive expression of Unworth and Unworth is that what is not worth doing is not worth doing well. This law seems simple, but its importance is always forgotten. Unworth reflects people's psychology. If a person is engaged in something that he doesn't think is worth doing, he often keeps a cynical and perfunctory attitude. Not only is the success rate small, but even if you succeed, you won't have much sense of accomplishment.

Eight, zero-sum game

Nine, the law of wine and sewage

X. Kirchner's Law There is a famous Kirchner's law in western management: If the actual number of managers is twice the optimal number, the working hours will be doubled and the working cost will be quadrupled; If there are three times more actual managers than the best, the working hours will be three times more and the working cost will be six times more.