China’s Bureau of Statistics is disputing the World Bank report that China will become the world’s biggest economy this year. The bureau says the calculation has constraints and doesn’t reflect the true picture of the Chinese economy.

How big is the Chinese economy? A recent World Bank report says it will overtake the U.S. to be the world’s biggest in 2014, as measured by Purchasing Power Parities, or PPPs.

But to some experts, the calculation is not accurate.

"PPPs compares two countries’ GDPs in term of expenditure. That needs a strong hypothesis, which is that consumers in the countries have same or similar spending preference. But sometimes, it is very difficult to find similar products in different countries. That hardly makes an accurate comparison," Professor Ren Ruoen from Beihang University said.

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