„The Negro slave trade was the first step in modern world commerce, followed by the modern theory of colonial expansion. Slaves as an article of commerce were shipped as long as the traffic paid.“

— W.E.B. Du Bois

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„The commerce of minds was necessarily the first commerce in the world, … since before bartering things one must barter signs, and it is necessary therefore that signs be instituted.There is no market or exchange without language. The first instrument of all commerce is language.“
— Paul Valéry
„You're a slave, a bound helpless slave to one thing in this world, your imagination.“
— F. Scott Fitzgerald