International migration

Compared to births and deaths, international migration plays a smaller role in population growth or decline in most countries and regions. Nonetheless, international migration can have a sizeable effect on population change under certain circumstances. In several high-income countries, immigration has made significant contributions to population growth. Over the next few decades, immigration is expected to continue to drive growth in some countries, while in others it will attenuate or counteract a potential decline in population size due to sustained low levels of fertility. With a few notable exceptions, emigration does not have a major impact on population change in countries and regions of origin.

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