> Those are the three primary mediums for selling ideas in modern society. Again, according to whom? Is this some generalization you're making up on the spot,

> Those are the three primary mediums for selling ideas in modern society. Again, according to whom? Is this some generalization you're making up on the spot, or a statement that is quantifiably provable? It's really not clear to me that video production is used to sell ideas significantly more than radio, or highway billboards, or public speaking.