Population Growth Rate is defined as which of the following?

• A. Birth rate plus natural increase rate
• B. Net migration rate minus natural increase rate
• C. Immigration rate minus emigration rate
• D. Net migration rate plus natural increase rate

Answer: (D)

Population Growth Rate measures how the number of people in a country changes over time by combining two parts: natural increase and net migration. Natural increase is births minus deaths, showing how many people are added or removed through reproduction and mortality. Net migration is the number of people entering minus those leaving the country. When you add natural increase to net migration, you get the total change in population. This is why the growth rate is defined as net migration rate plus natural increase rate. If you only looked at births, you’d miss people moving in or out; if you only counted immigration minus emigration, you’d ignore births and deaths; and if you subtracted natural increase from migration, the math wouldn’t reflect how population actually grows.