It was the year 2003. I was in Australia speaking at my first marketing conference. Well, not quite. It was billed as a marketing conference, but it was really a pitch-fest. The speakers delivered their speeches, and then sold their products from the podium. And there was one speaker who literally got people pushing and shoving each other to get his product. So what caused all the pushing and shoving? The "yes-yes" system It's a concept called the "yes-yes" system....