When, in The Wealth of Nations, Adam Smith wrote of "a sort of waggon-way through the air," he was referring to:

Name: When, in The Wealth of Nations, Adam Smith wrote of "a sort of waggon-way through the air," he was referring to:
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Adam Smith used the phrase "a sort of waggon-way through the air" to describe the concept of paper money, which facilitates trade and commerce by acting as a medium of exchange without the need for physical transportation of goods.

When, in the Wealth of Nations, Adam Smith Wrote of "A