First, if the number of enterprises is small, naturally there is no sense of crisis, and even monopoly can be achieved. Only when the number of enterprises is large, especially when a large number of new enterprises emerge, the formation of a buyer's market and fierce competition, enterprises have the motivation to improve themselves.

Second, scientific and technological dissemination is cultural reproduction, and large-scale dissemination is overreproduction. Overreproduction allows different theories to compete on a wide range, good theories are sought after, poor theories are ignored, then scientific and technological progress is promoted.

Third, if there is only one party, there will be dictatorship. Fierce competition among multiple parties will give incentive to improve oneself.

Fourth, in troubled times, many strong people make fierce competition, so many heroes appear. In peacetime, according to seniority, there is no competition and opportunities, so talent is buried.

Overreproduction is a necessary but not sufficient condition for the formation of competition for survival. For example, in the era of planned economy, there were many enterprises, but there was no need to compete for survival.

Theorem: The sufficient conditions for the formation of survival competition have four items: overreproduction, limited survival resources, the amount of resources obtained by each competing agent is related to its behavior, and the behavior of the competing agent can be changed.

3.2.2 The Principles of Natural Selection, Survival Struggle and Generalized Evolution of Human Groups

For different groups of people, the principles of natural selection, the principles of struggle for survival, and the principles of biological evolution can be extended as follows.

（1）The Principle of Natural Selection of Human Groups:

Major premise: the condition that any group of people can survive is that the rate of increase of people in this group is greater than or equal to the rate of disappear;

Minor premise: There is heritable variation among members of various groups of people; Some variations make the increase rate of new members more than other groups, which is called having greater reproductive capacity; Some variantions cause a group to lose members at a slower rate than other groups, which is called having greater survival capacity. The variation with greater reproductive ability and greater survival ability is the superior variation, and the opposite variation is the inferior variation.