World economy

The world economy refers to the total system of human economic activity across the entire planet. It encompasses the production of goods, the consumption of services, and the management of financial transactions. This system includes all work conducted within individual nations and the complex trade that happens between them. While some researchers distinguish between the "international economy" and the "world economy," the latter is often used as an aggregate of all national measurements.

Measuring the world economy is a complex process because values vary widely across different regions. Economists often use Gross Domestic Product (GDP) to represent the total value of production. To compare different currencies fairly, they frequently use Purchasing Power Parity (PPP). PPP is a method that translates local market valuations into a single unit, such as the US dollar or euro. This method is preferred over official exchange rates because official rates do not always reflect the true worldwide value of goods.

Economic activity is not always found in legal, regulated markets. The world economy includes the "black market," which involves the trade of illegal goods like drugs. Even without official government data or cooperation, these transactions are part of the global system. Furthermore, the world economy is deeply connected to the geography and ecology of Earth. The way people produce and exchange goods is limited by the natural resources and environments available to them.

Historical shifts have radically changed which regions lead the global economy. Until the middle of the 19th century, global output was dominated by China and India. However, the Industrial Revolution changed this balance of power. Waves of industrialization in Western Europe and Northern America shifted economic dominance to the Western Hemisphere.

Today, the economic landscape is much more distributed among many different nations and collectives.

As of 2025, several major players account for significant portions of the global economy. Twelve specific countries and two collectives hold at least 2.0% of the global economy in either nominal GDP or PPP terms. These include Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Russia, the United Kingdom, and the United States. Additionally, the European Union and the African Union are major economic entities.

These nations drive much of the world's current production and trade.

Wealth distribution has seen massive changes over the last two centuries. Between 1820 and 2000, global income inequality increased by almost 50%. This rise in inequality occurred mostly before 1950, while the level of inequality remained relatively stable after that. Experts distinguish between "between-country inequality" and "within-country inequality." Global inequality reached a peak in the 1970s, when the world was split into "rich" and "poor" countries with little overlap. Since then, the trend has shifted toward a "unimodal" distribution, meaning most people now live in middle-income countries.

Despite these trends, extreme wealth concentration remains a significant factor. A study by the World Institute for Development Economics Research found that the richest 1% of adults owned 40% of global assets. Another report from Oxfam International stated the richest 1% owned 48% of global wealth. In 2014, the 85 wealthiest individuals held combined wealth equal to the bottom half of the world's population, which includes about 3.5 billion people.

Recent global events have also caused major fluctuations in economic stability. During the COVID-19 pandemic in 2020, the global economy decreased by 3.4%. This was an improvement over the World Bank's initial prediction of a 5.2% decrease. Because cities account for 80% of global GDP, they were hit hardest by this decline. However, the economy showed resilience by rebounding with an estimated 5.5% increase in 2021.