Any sensible policy designed to address the concentration of income at the top of the Canadian income distribution over the past thirty years or so has to be based on a working model that explains how and why it happened in the first place. And we still don't have one. We still don't even have a good handle on the basic facts that this model should explain.
I think that one basic fact that such a model should explain is how the composition of the top earners group has evolved over time. So I'm going to present here some numbers from the Public Use Microdata Files for the censuses between 1981 and 2006.