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Smith´s observations about the concept of Supply and Demand have been proven true and used the world over in predicting things like the state of world trade, as well as avoiding disasters like stock market crashes.

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Several successful economies, including the world economy, are based on free market principles as established by Adam Smith.

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The Wealth of Nations was an advocacy and argument for a free market, supply and demand principles, and laissez - faire ideology.

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The Theory of Moral Sentiments proposed several theories about human nature and it's effect on social economics. It was particularly focused on the relationship between self interest and sympathy, and how this can be used as a moral and socioeconomic guide.