Fact: Average annual return on investment of a slave in 1810 was 15%-20%; today it is 300%-500%

     
 "The average annual return on investment of a slave for the exploiter in 1810 was 15%-20%; today it is 300%-500%, even higher for sex slaves."
                     -Siddharth Kara Sex Trafficking: Inside the Business of Modern Slavery (2009)