" Moreover, the 3.2 million people enslaved in the United States had a market value of $1.3 billion in 1850—one-fifth of the nation’s wealth and almost equal to the entire gross national product. They were more liquid than other forms of American property, even if an acre of land couldn’t run away or kill an overseer with an axe.14 "

― , The Half Has Never Been Told: Slavery and the Making of American Capitalism