Thanks for sharing. One argument Postman makes that I find compelling (if not wholly convincing) is that advertising has increasingly replaced "propositions" (testable statements of truth) with images and emotional claims (attractive celebrities, nice sound effects). Since liberal capitalism is built atop the assumption that buyers and sellers are informed and logical (or at least equally ignorant), Postman argues that "the television commercial has mounted the most serious assault on capitalist ideology since the publication of Das Kapital."<p>It would be interesting to see actual data on this. A team of researchers might take a representative sample of adverts from across the past century and code them for the degree to which they make refutable/provable statements. I'm not so sure you'd see a clear decrease in propsition-ness.