What are Murphy's Law, the 80/20 rule, and the watch theorem called?

Also known as Pareto's Law, it was discovered by Italian economist Valledo in the late 19th and early 20th centuries. He believed that in any group of things, the most important only accounts for a small part of it, about 20%, and the remaining 80%, although they are the majority, are secondary, so it is also called the 28/20 rule.

The "28/20 rule" is common in life. 80% of a merchant's sales come from 20%. For commodities, 80% of business revenue is created by 20% of customers; in a sales company, 20% of salesmen bring back 80% of new business, etc.; the "28 phenomenon" we usually use 80% of our energy, Do those things that will only achieve 20% of the results. At present, the ratio of "management" and "management" in domestic enterprise management work is generally 8:2, while the ratio of "management" and "management" in enterprise management work in developed countries in the world's economy is "Management" follows the ratio of 2:8. In the operation of insurance companies, 80% of the company's employees are in the logistics and 20% are on the front line; and the formulation of policies and the introduction of measures often consider the majority of 80% People's opinions and interests, not the laws of the market; use 80% of the time to deal with daily routine work, and use 20% of the time to do the important 80% of the work; consider the majority of the middle 80% in team management people, while ignoring the most prominent and the most backward groups. In fact, it is best to spend 80% of the energy on management of these 20% of the group. Regarding the high mobility of personnel in the agent team, various companies are exploring how to No company has succeeded in increasing the retention rate from 20% to 80%; in business promotion cases, it is common to see how to improve the performance of 80% of people, improve the overall level, and eliminate one-sided business and rely on stars to take the lead. This phenomenon often ignores the 20% of the most efficient people. There are many such phenomena that are against the "28/20 rule".