The Middle-Income Trap

Why many countries grow quickly out of poverty but then stall before reaching high income, and what it takes to keep climbing.

Escaping deep poverty is hard, but history suggests that the next step can be just as difficult. The middle-income trap describes a pattern in which a country grows rapidly from low to middle income, then slows down and stays stuck for decades, never quite reaching the ranks of rich nations. The term was popularized by World Bank economists Indermit Gill and Homi Kharas in 2007. It is a pressing question for countries such as India, which is now lower-middle income, and for China, Brazil, Turkey and many others.

How big is the problem?

The World Bank classifies countries by income per person. Countries above a high-income threshold, recently around 14,000 dollars of national income per person per year, count as high income. A widely cited World Bank analysis found that of roughly one hundred economies classed as middle income in 1960, only about thirteen had become high income by 2008. Those that made it included South Korea, Taiwan, Singapore, Hong Kong, Israel, Ireland, Spain, Portugal and Greece. Many Latin American countries, by contrast, reached middle income decades ago and have not moved much further up relative to the United States.

Some economists question whether this is a distinct trap or simply a reflection of the fact that growth tends to slow as countries get richer. Either way, the difficulty of the climb is real.

Why growth slows

Poor countries can grow fast through catch-up growth. They move workers from farms to factories, build basic infrastructure, and copy technologies already invented elsewhere. Low wages attract labor-intensive manufacturing, such as clothing and electronics assembly.

But these engines weaken over time. The pool of surplus farm workers shrinks, so wages rise and low-cost manufacturing moves to cheaper countries. Building more of the same factories and roads runs into diminishing returns: each additional machine adds less output than the one before. At this point, a country is too expensive to compete on cheap labor but not yet advanced enough to compete on cutting-edge products. It is squeezed from both sides.

The squeeze on a garment exporter

Imagine a country whose economy grew by exporting shirts. When workers earned 100 dollars a month, it was one of the cheapest places in the world to sew clothing. Twenty years later, wages have risen to 500 dollars a month, and buyers are moving orders to countries where workers earn 150 dollars. Meanwhile, the country's firms do not yet have the engineers, brands or research labs to compete with companies making high-end electronics or medicines. Unless it can raise productivity to justify higher wages, growth stalls. That is the middle-income trap in miniature.

What helps countries escape

To keep growing, a country must shift from copying to innovation and from adding more inputs to using them better. Economists point to several ingredients. Education systems must move beyond basic literacy to produce skilled engineers, scientists and managers. Firms need competition and access to global markets, which pushes them to improve. Financial systems must fund new ideas, not just established companies with political connections. Strong institutions, including the rule of law and control of corruption, matter more at this stage because complex economies depend on trust and contracts.

South Korea is the classic success. It moved from textiles and wigs in the 1960s to steel and ships, then to cars, electronics and semiconductors, while investing heavily in universities and research. The World Bank’s 2024 World Development Report described this path as a sequence of investment, then infusion of foreign technology, then innovation.

Assuming past growth rates will simply continue

When a country has grown 8 or 9 percent a year for a decade, it is tempting to project that pace forward and predict it will soon be rich. History shows that fast growth usually slows as easy gains are used up. Forecasts that ignore this have repeatedly been too optimistic.

Key takeaways

The middle-income trap describes countries that grow quickly, then stall before reaching high income.
Only a small number of middle-income economies in 1960 had become high income decades later.
Catch-up growth from cheap labor and copied technology eventually runs into diminishing returns.
Escaping requires innovation, advanced skills, competition and strong institutions.
South Korea is the best-known example of a country that made the full climb.