When I am finished speaking at a conference or advertising event people often ask me how I can be so sure I'm right and other people people are wrong. The answer is, I'm not. I spent 41 years in the agency business. I worked on some very big brands including McDonald's, Toyota, Bank of America, AT&T and others. And I had a pretty successful career and did some reasonably successful work. But that doesn't make me sure of anything. One thing I learned about advertising is that when you're trying to anticipate human behavior -- which is what marketers and advertisers do -- there are no sure things. All there are are likelihoods and probabilities. This is why I am highly skeptical about what I hear and read from advertising and marketing experts these days. Particularly those of the digital stripe. They tend to be awfully sure of themselves and very dismissive of those who disagree with them. They also tend to have a lot more opinions than experience. It is certainl...