A country’s population changes through only three doors: births, deaths, and migration.
For most of history and most of the world, the first two dominated, and the number of people rose or fell mainly with the balance between births and deaths.
But in the aging, low-fertility nations of the rich world, the third door, migration, has quietly become the decisive one.
That matters because migration is far smaller in scale than the headlines suggest, yet far more consequential than its size implies.
TL;DR
- There are an estimated 281 million international migrants globally, or 3.6% of the world’s population, meaning the vast majority of people still live in the country where they were born.
- Migration is growing, but from a modest base. The 281 million total in 2020 was 128 million more than in 1990 and over three times the estimated number in 1970.
- International remittances rose more than 650%, from 128 billion dollars in 2000 to 831 billion in 2022, with 647 billion going to low- and middle-income countries, surpassing foreign direct investment.
The data below are from the UN Population Division and the IOM World Migration Report 2024.
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| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | Metric | Figure |
|---|---|---|---|---|---|---|
| 1 | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | International migrants | 281 million (3.6% of the world) |
| 2 | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | Share who live in their country of birth | ~96% |
| 3 | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | Growth since 1970 | More than tripled |
| 4 | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | People displaced by conflict and disaster | ~117 million (end of 2022) |
| 5 | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | emmanuel-ashemiriogwa | 17/08/2026 01:55 PM | Remittances to developing countries (2022) | $647 billion |
The three components of change
Population change is arithmetic: births minus deaths, plus net migration.
In Sub-Saharan Africa, births vastly outnumber deaths, so natural increase drives growth and migration is a minor factor.
In much of Europe and East Asia, deaths are catching up to births as populations age, so natural increase is fading toward zero or turning negative.
In those places, net migration is increasingly the only thing keeping the population from shrinking.
The same total-population trend can therefore have completely different engines depending on the country.
Smaller than it seems, more decisive than it looks
At under 4% of humanity, migration is a modest share of the world’s people, and most of it is regional rather than long-distance, flowing along established corridors built up over decades.
Displacement from conflict, violence, and disaster reached a record high of about 117 million by the end of 2022, but that, too, is a fraction of the total movement.
What gives migration its outsized importance is timing: it arrives precisely when and where natural increase is disappearing, making it the demographic lever that determines growth in the wealthy world.
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ELI5
A country’s population goes up or down from births, deaths, and people moving in or out.
Only about 4 out of every 100 people live in a country different from the one where they were born, so migration is relatively small.
But in countries where few babies are being born, people moving in is the main reason the population still grows at all.
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