Last year (2014), China overtook the United States in gross domestic product adjusted for purchasing power (GDP-PPP, see point 4 for explanation), according to both the International Monetary Fund (IMF) and the World Bank (Note 1). It may come as a surprise, but this is really a matter of China simply reasserting its position as the world's largest economy, which it had lost around 1890 to the United States. This is based on estimates developed by the late legendary economist Angus Maddison of the Organization for Economic Cooperation and Development (OECD).
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