What is the 'rate of natural increase' in demography ?

The difference between birth rate and death rate. Birth rate divided by death rate. Death rate multiplied by death rate. Infant mortality rate.

The difference between birth rate and death rate.

The rate of natural increase or the growth rate of a population refers to the difference between the birth rate and the death rate. When this difference is zero (or, in practice, very small) then we say that the population has ‘stabilised’, or has reached the ‘replacement level.