Source: SmithsonianMag.com

“That Jefferson set out clearly for the first time was that he was making a 4 percent profit every year on the birth of black children. The enslaved were yielding him a bonanza, a perpetual human dividend at compound interest. Jefferson wrote, “I allow nothing for losses by death, but, on the contrary, shall presently take credit four per cent. per annum, for their increase over and above keeping up their own numbers.” His plantation was producing inexhaustible human assets. The percentage was predictable.” Read more at http://www.smithsonianmag.com/history-archaeology/The-Little-Known-Dark-Side-of-Thomas-Jefferson-169780996.html