The G20 countries control 86% of the world's economy, leaving the remaining 173 countries the remaining share.
The total size of the economies of the 20 richest countries is about $91 trillion, and they account for 88% of global trade, according to International Monetary Fund (IMF) data.
The economy of the United States alone accounts for about a third of the G20 economies, followed by China with a fifth share.
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