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Middle-income countries¡ªhome today to 6 billion people¡ªare in a race against time.

Since the 1990s, many of them have done well enough to escape low-income levels and eradicate extreme poverty, leading to the general perception that the last three decades have been great for development. But their expectations have been abysmally low¡ªremnants of a period when more than two-thirds of the world lived on less than a dollar a day.

Today, 108 countries are classified as middle-income. The ambition of many of them is to reach high-income status within the next two or three decades. However, when assessed against this goal, their record is dismal. Since the 1990s, only 34 middle-income economies have attained high-income status. Together, they account for less than 250 million people¡ªthe population of Pakistan. And since 1970, the median income per capita of middle-income countries has never risen above 10 percent of the US level.

To escape the ¡°middle-income trap,¡± countries need to undergo two transitions.

With rising debt and aging populations at home, growing protectionism in advanced economies, and escalating pressures to speed up the energy transition, today¡¯s middle-income countries are facing growing headwinds. World Development Report 2024 identifies pathways for these countries to avoid the middle-income trap. To do so, they will need to undergo not one but two transitions:

• The first is to transition from a ¡°1¾±¡± strategy for accelerating investment to a ¡°2¾±¡± strategy that emphasizes both investment and infusion, in which a country brings technologies from abroad and diffuses them domestically.
• Once a country has succeeded, it can switch to a ¡°3¾±¡± strategy, in which it adds innovation to the mix of investment and infusion.  

They need to adopt different growth strategies at different stages of development.

Depending on their special circumstances and the stage of development they have reached, countries need to adopt a sequenced and progressively more sophisticated mix of policies (see table):

• Low-income countries can focus solely on policies designed to increase investment¡ªthe 1i approach. 
• Once they attain lower-middle-income status, countries must shift gears and expand the policy mix to 2i, investment + infusion.
• At the upper-middle-income level, countries need to shift gears again to 3i: investment + infusion + innovation. 

Transitions across growth strategies are not automatic.

Middle-income countries will need progressively greater economic freedom, ever more open and informed debates, and¡ªever more frequently¡ªthe political courage to change stubborn institutions and long-standing arrangements.

The handful of countries that have made speedy transitions from middle- to high-income status have encouraged enterprise by disciplining powerful incumbents, developed talent by rewarding merit, and capitalized on crises to alter policies and institutions that are no longer suited for the purposes they were once designed to serve. Today¡¯s middle-income countries will have to do the same:

• Discipline incumbents. Incumbents¡ªlarge corporations, state-owned enterprises, and powerful citizens¡ªcan add immense value, but they can just as easily reduce it. Governments must devise mechanisms to discipline incumbents through competition regimes that encourage new entrants without either coddling small- and medium-size enterprises or vilifying big corporations.
• Reward merit activities. Middle-income countries have smaller reservoirs of skilled talent than advanced economies and are also less efficient at utilizing them. So they will have to become better at accumulating and allocating talent.
• Capitalize on crises. Cheap, reliable energy has been a cornerstone of rapid economic development, but prospering while keeping the planet livable will now require paying more attention to energy efficiency and emissions intensity. Exigencies such as climate change provide opportunities to dismantle outdated arrangements and make room for new ones. In democracies, crises are painful, but they can help forge the consensus needed for tough policy reforms.

Table O.3 The 3i strategy: What countries should do at different stages of development

^{Source: WDR 2024 team.
Note: SOEs = state-owned enterprises.}