Americans marked off property, courts recognized that property, and the people got deeds that meant everyone knew their property was theirs. They could then buy and sell and borrow against it as they saw fit.

This idea of a deed protecting property seems simple, but it's powerful. Commerce between total strangers wouldn't happen otherwise. It applies to more than just skyscrapers and factories. It applies to stock markets, which only work because of deed-like paperwork that we trust because we have the rule of law.

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