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Dependency ratio
The dependency ratio measures the proportion of dependents (people aged below 15 and above 65) to the working-age (economically active) population (15–64).
Older dependency ratio measures the proportion of old dependents (people aged above 65) to the working-age (economically active) population (15–64).
Migration
Migration is the movement of people from place of origin to place of destination that involves changing place of residence.
Migration can be domestic or international, voluntary or forced, legal or illegal, permanent or temporary.
Other forms of spatial mobility include commuting (regular travel of individuals between their home and place of work or study) and tourism (traveling to places different from one's usual environment for leisure and recreation).
Urbanization
Urbanization refers to the increasing proportion of people living in cities, fueled primarily by migration (mostly domestic) and natural increase.