The richest cities in the world are determined by their gross domestic product, or GDP. According to Investopedia, ‘Gross domestic product (GDP) is the total monetary or market value of all the finished goods and services produced within a country’s borders in a specific time period.’ In this case, we are looking at the GDP of metropolitan statistical areas, and not countries. For instance, the city of New York is a metropolitan area made up of 5 boroughs with each borough contributing to the cities overall GDP.

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