Well, that depends on what exactly you mean by strong. If we're talking the fastest growth rates, then the strongest economies are still the big emerging markets like China and India.

They're able to grow quickly, however, in part because they are much poorer than industrialized countries like the US and can borrow ideas and technology from others. In fact, America's economy is looking remarkably robust; it has been growing consistently for about seven years now, and average incomes there are among the highest in the world.

On the other hand, economies like Germany, while not quite as rich, are growing while also managing to achieve a distribution of income that is less unequal than America's.

Source: https://www.quora.com/Which-countries-have-the-strongest-economies-in-2016

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