What does comparative advantage have the most influence on?

Comparitive Advantage is an economic law that demonstrates the ways in which protectionism (mercantilism, at the time it was written) is unnecessary in free trade. Popularized by David Ricardo, comparative advantage argues that free trade works even if one partner in a deal holds absolute advantage in all areas of production - that is, one partner makes products cheaper, better and faster than its trading partner.

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"pacesetter of the south," comma inside the quotes