GDP is the single most commonly referenced figure to cover the entirety of a national economy and the trajectory it is on in a single statistic. Measured annually, quarterly, or monthly, trends in GDP for a single country or comparisons among peer countries are often called out in popular press, sometimes with alarmist tones that can make one wonder why or how this single data point has taken on such importance. Anyway, without further ado check out these 15 largest economies in the world by 2015 PPP, you will understand the importance of GDP quite easily!
Comparisons of national wealth are also frequently made on the basis of purchasing power parity (PPP), to adjust for differences in the cost of living in different countries. PPP largely removes the exchange rate problem, but has its own drawbacks; it does not reflect the value of economic output in international trade, and it also requires more estimation than nominal GDP. On the whole, PPP per capita figures are less spread than nominal GDP per capita figures. No wonder these 10 richest countries in the world by 2015 GDP are in this list as well.
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