AP® Human Geography · Unit 2 · Topic 2.10
Push Factors, Pull Factors, and Intervening Obstacles
Migration happens when push factors driving someone away from a place combine with pull factors drawing them toward another, and the decision gets filtered through whatever obstacles or opportunities appear along the route.
Push factors are conditions at the origin that make people want to leave: civil war, famine, religious persecution, lack of jobs, or environmental collapse. Pull factors are conditions at a destination that attract them: higher wages, political freedom, family already settled there, or open land. No two people weigh these the same way. One villager might have a sick parent to care for, a farm that still turns a profit, or deep ties to a local church, so the push barely registers. Their neighbor, with none of those anchors and a cousin already working abroad, feels the same local conditions as unbearable. The decision is always a personal balance sheet, not a universal formula.
Even a strong push-pull combination does not guarantee the move happens as planned. Intervening obstacles get in the way: a mountain range, a visa requirement, the cost of travel, or a border wall. These can stop migration entirely or force a longer, riskier route. Separately, an intervening opportunity can end a journey early in a good way — a migrant heading for a distant capital finds adequate work in a city along the route and simply stays, because the underlying motive, a job, is already satisfied. A new obstacle, like a border wall, does not usually erase the pull; it reroutes the flow toward unofficial crossings, raises the cost and danger of the trip, or shifts migration toward countries with fewer barriers.
This framework connects directly to the causes behind every arrow on a migration flow map. The demographic transition model explains population change within a country, while push-pull-obstacle thinking explains why people cross borders in response to that change, linking the two halves of the unit.
Key terms
- Push factor
- A condition at a migrant's origin that motivates them to leave, such as war or lack of opportunity.
- Pull factor
- A condition at a potential destination that attracts migrants, such as jobs or political freedom.
- Intervening obstacle
- A barrier, physical or political, that hinders or blocks movement between origin and destination.
- Intervening opportunity
- A closer destination that satisfies a migrant's underlying motive and ends the journey before the original goal.
Watch it explained
- How it worksHow do push factors, pull factors, and intervening obstacles combine into one migration decision?
- How it worksWalk me through a migration route where an intervening opportunity ends the journey early.
- Going furtherWhat happens to a migration flow when a new border wall becomes an intervening obstacle?
- Common mistakeWhy isn't every migration driven mainly by economics?
Check yourself
End of topic.