Counterintuitive fact: As incomes rise in poor countries and poverty decreases, more people emigrate. Not fewer. The opposite of what we'd expect.
The intuition seems airtight. Migration is hard. It costs money—for airfare, documentation, bribes, housing deposits in a new place. It requires connections, information about opportunities abroad, and enough education to navigate foreign labor markets. So naturally, the poorest people in the poorest places should be the ones moving, right? They're the ones with the most to gain. Yet they rarely do. Instead, it's people in countries that are getting richer who pack up and leave. As research highlighted in VoxDev's 2024 survey of development economics shows, this migration pattern holds across Latin America, Southeast Asia, and sub-Saharan Africa. The relationship isn't even close to linear. It's inverted.
The mechanism is simple once you see it. Migration requires what economists call a "mobility threshold." You need savings to cover moving costs. You need enough education to qualify for a visa or find work abroad. You need information networks—family or friends already overseas who can vouch for you, help you navigate a foreign bureaucracy, maybe loan you money. Crucially, you need to believe your situation can improve enough to justify the risk. Trapped in extreme poverty with no education and no connections, you can't migrate even if you want to. But as development lifts incomes, creates education opportunities, and builds the infrastructure of a functioning economy, more people suddenly can move. They have the resources, the qualifications, the networks. And they do.
What's more, this effect persists even when controlling for wage gaps between countries. It's not just that richer countries pull immigrants—it's that development in origin countries actively enables emigration. A teenager in rural Bangladesh today is vastly more likely to leave for the Middle East or North America than her equivalent from 1990, even though Bangladesh is still much poorer than those destinations. Why? She likely went to secondary school. Her family has saved money. She knows someone who's already abroad. Development didn't trap her in place—it gave her options.
This pattern has a name in the migration literature: the "mobility transition." Countries don't move smoothly from "everyone stays" to "everyone leaves." Instead, there's a sweet spot—middle-income countries experience the highest emigration rates. Bangladesh, Vietnam, and the Philippines, which have achieved middle-income status but haven't yet matched Western wages, export vastly more migrants than either the poorest countries or wealthy ones. Once countries get genuinely rich, emigration actually tends to stabilize or decline, partly because wage gaps shrink and partly because the remaining non-migrants are those with the weakest incentives to leave.
The implications are awkward for development policy. A lot of aid and policy aims to reduce poverty precisely to reduce migration—to give people reasons to stay home. The evidence suggests that works, but only as a temporary phase. The path to reducing emigration isn't keeping people poor. It's getting them so rich that staying home makes economic sense. Which means for decades, successful development in poor countries will likely mean more people leaving for rich ones. That's not failure. It might just be what progress looks like.