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Top 10 Richest Countries In the World. As of my last knowledge update in January 2022, the ranking of the world's richest countries can change over time due to various economic factors. The wealth of a country is often measured by its Gross Domestic Product (GDP), which represents the total value of all goods and services produced within a country's borders. As of 2022, some of the wealthiest countries included: United States China Japan Germany India United Kingdom France Brazil Italy Canada Keep in mind that economic conditions and rankings can change, so it's advisable to check the most recent data from reliable sources such as the International Monetary Fund (IMF) or the World Bank for the latest information on the wealthiest countries.