The dissertation by Markus Sachs titled "Business Thinking and Acting in Ancient Rome" examines the business aspects of the Roman economy from the 3rd century BC to the 3rd century AD. Sachs argues that Roman farmers, craftsmen, and merchants had common business thinking and action patterns. He supports this with evidence from agricultural authors such as Cato, Varro, and Columella, showing that business knowledge existed in ancient Roman society and was passed down through "textbooks." Sachs concludes that market principles and a market-oriented system prevailed in ancient Rome.