Stanley Engerman of the University of Rochester talks about slavery throughout world history, the role it played (or didn't play) in the Civil War and the incentives facing slaves and slave owners. This is a wide-ranging, fascinating conversation with the co-author of the classic Time on the Cross (co-authored with Robert Fogel) and the forthcoming Slavery, Emancipation, and Freedom (LSU Press, 2007). Engerman knows as much as anyone alive about the despicable human arrangement called slavery and the vastness and precision of his knowledge is on display in this interview.