each medium embodies a bias in terms of the organization and control of information.

Time-biased media, such as stone and clay, are durable and heavy. Since they are difficult to move, they do not encourage territorial expansion; however, since they have a long life, they do encourage the extension of empire over time.

Space-biased media are light and portable; they can be transported over large distances. They are associated with secular and territorial societies; they facilitate the expansion of empire over space. Paper is such a medium; it is readily transported, but has a relatively short lifespan.

It was Innis’ conviction that stable societies were able to achieve a balance between time- and space-biased communications media.

He also believed that change came from the margins of society, since people on the margins invariably developed their own media. The new media allow those on the periphery to develop and consolidate power, and ultimately to challenge the authority of the centre.

Oral communication, speech, was considered by Innis to be time-biased because it requires the relative stability of community for face-to-face contact. Knowledge passed down orally depends on a lineage of transmission, often associated with ancestors, and ratified by human contact. In his writings, Innis is forthright in his own bias that the oral tradition is inherently more flexible and humanistic than the written tradition, which he found rigid and impersonal in contrast.