Adam Smith claimed that businessmen were, on the whole, more trustworthy than diplomats. His argument was based on the importance of repeated interactions. Essentially, Smith argued that repeat business was usually more important to businessmen than to diplomats. Smith argued that diplomats frequently broke treaties since treaties are made infrequently. As a result, the gain from breaking treaties often exceeds the gain from living up to the obligations imposed by the treaties.

Another, much more famous, result of Adam Smith shows that under certain conditions, businessmen in competitive industries would promote the general welfare, even though they were only trying to increase their profits. These conditions include that businessmen are prevented from colluding-Smith correctly argued that businessmen try to collude in order to exercise monopoly power- and Smith assumed consumers could punish dishonest businessmen.