Why People Migrate: Push and Pull Factors

How economists explain the decision to move, using push factors, pull factors, and the real costs that stand in between.

Migration is the movement of people from one place to another with the intention of living there for a meaningful stretch of time, whether that means moving to a new city in the same country or to a different country entirely. Economists usually explain the decision to migrate by weighing push factors, the conditions that encourage people to leave a place, against pull factors, the conditions that attract them somewhere new.

Push factors: reasons to leave

Push factors are the difficulties at home that make staying less attractive. Common economic push factors include a lack of jobs, low wages, failing harvests, or land that can no longer support a growing family. Other push factors are not mainly economic at all: conflict, persecution, natural disasters, or a lack of safety. Often several push factors work together. A family whose farm income is falling may also face poor schools and limited health care nearby, and the combination tips the decision.

Pull factors: reasons to go

Pull factors are the attractions of the destination. The most studied is the wage gap: the same worker can often earn several times more in a richer city or country, because the destination has more capital, better infrastructure, and more productive businesses. Other pull factors include better education for children, stable institutions, family members who already live there, and simply the chance to build a different kind of life.

The costs in between

If wage gaps were the whole story, far more people would move than actually do. Worldwide, estimates suggest only about 3 to 4 percent of people live outside the country where they were born. The reason is that migration has real migration costs: travel and paperwork, visa rules, time without income while searching for work, learning a new language, and the emotional cost of leaving family and familiar places. Economists often describe migration as an investment: people pay costs now in exchange for expected gains later.

Weighing a move like an investment

Imagine a young worker earning 200 dollars a month at home who could earn about 600 dollars a month in a city some distance away. That is an extra 400 dollars a month. But moving would cost around 500 dollars for travel, a rental deposit, and a few weeks without pay while looking for work, plus higher rent in the city of about 150 dollars a month. After rent, the real gain is closer to 250 dollars a month, so the worker would earn back the upfront cost in about two months. A gap that looks enormous on paper shrinks once costs are counted, which is exactly why many people with large wage gaps still choose to stay.

Why networks matter so much

One of the strongest patterns in migration research is that people tend to follow others they know. Migrant networks, meaning relatives, friends, and neighbours who moved earlier, lower the cost and risk of moving. They share information about jobs, offer a place to stay, and help newcomers find their feet. This is why whole villages often send migrants to the same few destinations, and why migration flows, once they start, can continue for generations.

It also explains a surprising finding: the very poorest people are often not the most likely to migrate internationally. Moving abroad costs money, so migration can rise as a poor country’s incomes first grow, because more families can finally afford the upfront cost.

Assuming migration is only about money

Wage gaps matter a great deal, but they rarely explain a decision on their own. Safety, family ties, education for children, and personal ambitions all shape where people go and whether they move at all. A model that looks only at wages will miss why many people stay despite large pay differences, and why others move for reasons that have little to do with pay.

Key takeaways

Migration decisions weigh push factors at home against pull factors at the destination.
Wage gaps are a powerful pull factor, but migration costs mean most people never move.
Economists often treat migration as an investment: costs now, expected gains later.
Migrant networks lower costs and risks, so people tend to follow others they know.
The very poorest often cannot afford to migrate far, so migration can rise as incomes first grow.