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Is there any confirmed saying on this problem?

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closed as too broad by Jamzy, Giskard, optimal control, cc7768, BKay Oct 12 '15 at 23:17

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In short: Yes and due to comparative advantage.

The level of GDP growth gained with opening trade does vary by country and time. I'd suggest Wacziarg & Welch (2008). Trade Liberalization and Growth: New Evidence, World Bank Economic Review, vol. 22(2) for a relatively new study on the subject.

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