When the elder Cato was asked what he thought was the most profitable way of utilizing one's resources, he replied, "Grazing livestock successfully", what second to that, "Grazing livestock fairly successfully", what third, "Grazing livestock unsuccessfully"; what fourth, "Raising crops." When his questioner asked, "What about money-lending?" Cato replied "What about murder?" (Cicero On Duties 2.89).
J. C. McKeown, A Cabinet of Roman Curiosities: Strange Tales and Surprising Facts from the World's Greatest Empire, Oxford University Press, 2010