According to a paper by academics affiliated with World Inequality Lab, India is predicted to overtake China in terms of its global GDP share measured in purchasing power parity (PPP) by 2060, since Beijing's contribution is forecast to decrease in the second half of the twenty-first century.
The Paris School of Economics (PSE) is home to the World Inequality facility (WIL), a research facility dedicated to the global study of inequality.The Paris School of Economics (PSE) is home to the World Inequality facility (WIL), a research facility dedicated to the global study of inequality.
According to the Global Justice Report: A Plan for Equality and Prosperity With Planetary Boundaries, it is important to note that China's share of the global GDP is currently around 20% in PPP terms, which is roughly one-third higher than the US. Our benchmark projections indicate that by 2035, it will be twice as large as the US.

"However, China's population share is falling very fast, from 23 per cent of the world population in 1945 to about 17 per cent in 2025 and less than 8 per cent in 2100."As a result, it is anticipated that China's GDP share will stabilise and decrease in the second half of the twenty-first century, with India surpassing it about 2060.
In any event, the report stated that China is extremely unlikely to ever achieve the kind of global hegemony that the US had around 1950 (with as much as 35–40 percent of the world's GDP) or that Europe had around 1900–1910 (around 40–45 percent).

In summary, it stated that, in contrast to the worlds of the 19th and 20th centuries, the 21st century is expected to be multipolar.
According to the paper, it is also noteworthy that India has significantly higher inequality than China but much slower productivity growth. However, this can also be explained by China's higher and more focused investments in human capital.
The entire quantity of products and services that one unit of one nation's currency can purchase in another nation is measured by purchasing power parities, or PPPs.

The amount of currency from country A needed to buy a basket of goods and services in nation B is measured by the PPP between countries A and B. A is contrasted with the amount of money needed in country B to buy a comparable basket of goods and services there.
The most recent World Economic Outlook (WEO) projects that India's GDP, or the total value of all goods and services produced domestically, will reach approximately USD 4.15 trillion in 2026 (up from USD 3.92 trillion in 2025), the UK's GDP will reach USD 4.27 trillion (up from USD 4 trillion in 2025), and Japan's GDP will actually decline from USD 4.48 trillion in 2025 to USD 4.38 trillion in 2026.

The second-largest economy, China, is predicted to have a GDP of USD 20.85 trillion in 2026, compared to USD 32.38 trillion for the United States.