What is the fastest growing type of population reproduction?

There are two aspects to population growth: one is mechanical growth, and the other is natural growth.

Mechanical growth refers to the increase or decrease of population caused by population migration.

Natural growth refers to the increase or decrease of population caused by the birth and death of people.

According to the birth rate, death rate and natural growth rate, it can be divided into the following four types.

Primitive type is characterized by high birth rate, high mortality rate and low natural growth rate. It only exists in some areas of developing countries, such as the marginal areas of primitive rainforests.

The traditional type is characterized by high birth rate, high mortality rate and low natural growth rate. It only exists in some areas of a few developing countries.

The transitional characteristics are high birth rate, low death rate and high natural growth rate. Most of the countries represented are developing countries.

Modern type is characterized by low birth rate, low mortality rate and low natural growth rate. The representative countries are mainly developed countries, such as Finland, Germany and Sweden in Europe.