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Buying and selling is the nerve of human life that sustains the universe. By means of buying and selling the world is united, joining distant lands and nations, people of different languages, laws and ways of life. If it were not for these contracts, some would lack the goods that others have in abundance and they would not be able to share the goods that they have in excess with those countries where they are scarce.

-Bartolomé de Albornoz, 16th-century Spanish theologian