Zero population growth (ZPG) occurs when there is no change in the amount of people in a given time. ... Thus, zero population growth occurs when birth and death rates are equal. Birth rate refers to the amount of births per 1,000 people per year, while death rate refers to the amount of deaths per 1,000 people per year.

What happens to a population at zero population growth?

Zero population growth refers to a population that is unchanging – it is neither growing, nor declining; the growth rate is zero. ... Therefore, a country that has reached zero population growth has a population where births plus immigration is equal to deaths plus emigration over the course of a year.

What stage has zero population growth?

With low birth rates and low death rates, population growth rate is approximately zero in Stage 4 (Figure 3.4. 2).