politics, too, had the form of agon: an oratorical contest, a battle of arguments whose theater was the agora, the public square, which had been a meeting place before it was a marketplace.
Vernant identifies the agora as the spatial theatre of political agon, arguing that its primary function was oratorical and deliberative rather than commercial, making it the institutional form of the new rational-political consciousness.
, The Origins of Greek Thought, 1982thesis