Would you make a good literary editor? See if you can spot any problems in these lines. They come from a book review published in The Economist, since removed from its original URL, but accessible by means of a further link, with a warning
Mr Baptist cites the testimony of a few slaves to support his view that these rises in productivity were achieved by pickers being driven to work ever harder by a system of “calibrated pain” … Slave owners surely had a vested interest in keeping their “hands” ever fitter and stronger to pick more cotton. Some of the rise in productivity could have come from better treatment. Mr Baptist has not written an objective history of slavery. Almost all the blacks in his book are victims, almost all the whites villains. This is not history; it is advocacy.