Iconic and Economic Motivation

The distance between linguistic expressions may be an iconically motivated index of the conceptual distance between the terms or events which they denote. But the length of an utterance may also correspond to the extent to which it conveys new or unfamiliar information. Reduced form may thus be an economically motivated index of familiarity. Much of the arbitrariness of grammatical structure arises where equally plausible motivations such as iconicity and economy are, in effect, competing for expression on the same linguistic dimension.