Another central concept in the pioneering Innis theory was the idea that each medium of communication tended to create a dangerous monopoly of knowledge. Before (HarroldInnis?) decided to become an economist, he thought seriously about becoming a Baptist minister. The economist's interest in competition, in this case competition between media, was linked to the radical Protestant's critique of priestcraft. Thus he argued that the intellectual monopoly of medaeval monks, based on parchment, was undermined by paper and print, just as the 'monopoly power over writing' exercised by Egyptian priests in the age of hieroglyphs had been subverted by the Greeks and their alphabet.