What is the formula for Net Migration?

Net Migration is determined by the difference between the number of people moving into a given area (immigration) and the number of people leaving that area (emigration). This formula, which is represented as immigration number minus emigration number, helps to quantify how a population is changing due to migration.

When immigration exceeds emigration, the net migration figure will be positive, indicating that the population is growing in that area due to migration. Conversely, if emigration exceeds immigration, the net migration figure will be negative, indicating a decline in population attributable to movement out of the area. This concept is crucial in geography as it helps understand demographic trends, economic conditions, and social dynamics within specific regions.

The other options do not accurately represent net migration. For instance, the formula for natural increase does not consider migration and instead focuses solely on the balance of births and deaths. Thus, focusing on the calculation of immigration minus emigration provides the clear indicator needed to assess net migration.