The interplay between the Roman economic and legal orders is one of the most important areas calling for research and analysis. There is no lack of excellent descriptions of the economic life of antiquity. In contrast, legal-historical enquiries into the legal-economic issues of Roman times are still in the initial stages. This dearth of research is mainly the result of the unsatisfactory state of Roman legal sources, which rarely deal with economic issues. It is a stroke of luck to find sufficient documentation on any specific topic. One such fortunate case, that of restraint of trade, exists. There are no fewer than seven Digest texts on the topic. These will be analyzed below, in conjunction with a comparative survey of the development of this aspect in modern law.