These terms are particularly attractive because the classical Greek word from which they stem, katalattein or katalassein, meant not only ‘to exchange’ but also ‘to receive into the community’ and ‘to turn from enemy into friend’, further evidence of the profound insight of the ancient Greeks in such matters (Liddell and Scott, 1940, s.v. katallasso). This led me to suggest that we form the term catallaxy to describe the object of the science we generally call economics, which then, following Whately, itself ought to be called catallactics.