Which measure reflects births minus deaths and determines how fast a population grows?

• A. Fertility Rate
• B. Life Expectancy
• C. Natural Increase Rate
• D. Population Growth

Answer: (C)

Births minus deaths represents how the population changes due to natural processes only. The measure that captures this difference as a rate—showing how fast the population grows or shrinks from births and deaths alone—is the natural increase rate. It expresses the net addition (births minus deaths) per 1,000 people per year or as a percentage, and it does not include people moving into or out of the area.

Think of it this way: if the birth rate is higher than the death rate, the natural increase rate is positive and the population grows; if the death rate exceeds births, it’s negative and the population shrinks. Migration can alter the total population size, but the natural increase rate specifically isolates the birth-death component.

Fertility rate looks at how many children people are likely to have (a measure of potential births), not the actual net change after deaths; life expectancy is about how long people are expected to live, not how quickly a population grows; and total population growth includes migration as well as natural increase, so it isn’t limited to births minus deaths.