World economy

• 1. Introduction

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  The world economy is the economy of every human being on Earth, and yet no single number can fully capture it. Economists debate how to measure it, which currencies to use, and how to account for the billions of transactions that never appear in any official ledger. Illegal drug markets, for instance, are by any standard part of the global economy, yet by definition they have no legal market to measure. The world's 7.8 billion people generate wealth through production, consumption, trade, and financial exchange. But roughly how many of them are truly reflected in the figures economists publish? That question has no clean answer. What we do know is that the story of how global wealth formed, shifted, and concentrated across continents is one of the most consequential stories in human history. And it begins, perhaps surprisingly, not in Europe, but in China and India.

• 2. Measuring the Unmeasurable

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  Economists face a stubborn problem when they try to compare output across borders: official exchange rates rarely reflect what money can actually buy. A dollar spent in a low-wage country buys far more than a dollar spent in New York. To get around this, economists translate local market values into a common unit using purchasing power parity, or PPP. This approach lets us estimate worldwide economic activity in terms of real United States dollars or euros. By that measure, the gross world product reached an estimated $110.06 trillion in 2025. But even that figure has gaps. Governments sometimes regulate the volume or price of transactions so tightly that exchange rates tell you almost nothing about real value. Researchers may lack genuine data or government cooperation. The World Institute for Development Economics Research, working through the United Nations University, found that the richest 1 percent of adults owned 40 percent of global assets. That finding required painstaking estimation across dozens of national datasets. For the least developed countries, the UN uses a specific list first established by resolution 2768 in November 1971 to track which nations fall furthest behind. That classification still shapes how aid and investment are directed today.

• 3. Wealth and Its Concentration

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  Oxfam International reported that the richest 1 percent of people owned 48 percent of global wealth, and projected they would own more than half by 2016. In 2014, Oxfam put a human face on that figure: 85 individuals held combined wealth equal to the bottom half of humanity, roughly 3.5 billion people. Between 1820 and 2000, global income inequality rose by almost 50 percent, though most of that widening happened before 1950. After mid-century the gap stabilized. The real turning point came around the 1970s, when world income split into two sharply distinct groups. Economists describe this as a bimodal distribution: rich countries clustered in one peak, poor countries in another, with almost no middle. Since then the pattern has flipped. Income distribution has shifted to a single peak, with most people now living in middle-income countries. Sub-Saharan Africa, which accounts for 45 countries in the global groupings, holds about 1.9 percent of nominal global GDP. That gap between population share and economic share is the clearest single number capturing what inequality looks like across continents.

• 4. The Pandemic and the Rebound

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  In 2020, despite high levels of government investment and emergency spending, the global economy contracted by 3.4 percent. The World Bank had initially predicted a steeper fall of 5.2 percent, so the actual outcome was in one sense better than feared. Cities bore the heaviest losses: they account for 80 percent of global GDP, so the lockdowns and restrictions that hit urban economies first rippled outward fastest. The rebound came sharply. In 2021 the world economy expanded by an estimated 5.5 percent. That recovery was uneven across regions, but the speed surprised many forecasters. The episode also exposed the limits of standard economic statistics. Unemployment worldwide hit 8.7 percent in 2009 during the previous major downturn, a figure that masked far higher rates of underemployment in non-industrialized countries. During the pandemic, similar undercounting made the true scale of job loss in informal economies very difficult to assess.

• 5. The Shift from East to West and Back

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  Until the middle of the 19th century, China and India together dominated global output. Then successive waves of industrialization across Western Europe and Northern America shifted the balance decisively toward the Western Hemisphere. By 2026-12 individual countries and 2 collectives each account for at least 2 percent of the global economy, measured by either nominal GDP or PPP. The G7, the group of major advanced economies spanning Europe, North America, and Asia, holds 43.8 percent of nominal global GDP while representing only 7 countries. Emerging and developing Asia, by contrast, accounts for 23.5 percent in nominal terms but 35.5 percent when measured by purchasing power parity. That gap between nominal and PPP shares is the statistical signature of the ongoing eastward rebalancing. The Royal Society noted in 2011 that the United States led the world in the number of scientific research papers published, followed by China, the UK, Germany, Japan, France, and Canada. China's position in that ranking reflects the same structural shift visible in the GDP tables.

• 6. Resources, Waste, and the Natural Limit

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  The world economy cannot be separated from the geography and ecology of Earth. That principle shows up in a set of numbers that rarely appear alongside GDP tables. As of 2021, roughly 10 billion trees were lost annually on a net basis. Between 2015 and 2020, global deforested land averaged 10 million hectares per year. Soil erosion by water reached approximately 43 billion tons in 2015, carrying with it an estimated annual loss of 8 billion US dollars in agricultural productivity. Air pollution causes around 7 million deaths worldwide each year, at an estimated global cost of 5 trillion US dollars annually. Plastic production reached about 380 million tonnes per year as of 2018. Of the roughly 6.3 billion tonnes produced from the 1950s through 2018, only about 9 percent was recycled and 12 percent incinerated. In the North Atlantic Ocean alone, microplastic particles were estimated at between 15 and 51 trillion particles as of 2014, weighing up to 236,000 metric tons. These figures sit in the statistical indicators section of most reports on the world economy, but they represent costs the standard GDP measure does not subtract. Official Development Assistance reached $204 billion in 2022, a transfer meant partly to address the ecological and developmental debts these numbers represent.