John D'Arms explores here a question of central importance for the social economic history of the Roman which sectors of society were actively engaged in trade? In the late Roman Republic and early Empire senators were prohibited by law from direct participation in seaborne commerce; trade was not considered a respectable pursuit. Yet large fortunes were amassed by men of rank through a variety of lucrative enterprises. Exploiting the evidence of literature, archaeology, and inscription, D'Arms constructs case histories which reveal how senators realized commercial profits by indirect freedmen, municipal notables, and "friends" often served as the equivalent of partners or agents of aristocrats with large holdings in land. In demonstrating a flexibility in upper-class attitudes toward commercial activity, he offers a study in the adaptation of a social system to economic realities.