international trade
Ricardo's theory on international trade focused on comparative costs and looked at how a country could gain from trade when it had relatively lower costs (i.e. a comparative advantage). The original example focused on the trade in wine and cloth between England and Portugal. Ricardo showed that if one country produced a good at a lower opportunity cost than Another Country, then it should specialise in that good. The other country would therefore specialise in the other good, and the two countries could then trade.
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The main reason why David Walker is important is due the fact that he was an outspoken abolitionist. He was also an anti-slavery activist.
if they have changed peoples lives in any way. even there ideas or beliefs. any thing that has efected anything majourly. sso most probably NOT david bhecam
which civilization was most affected by new ideas
David Thomson.
David Rittenhouse