Michael Rozworski wrote a piece about it recently. In brief: the basic thesis of the book is that capitalism has a tendency towards the concentration of wealth in few hands. And there's a discrimination inherent in the system that ensures whites are better able to make it at least into the middle.
In Canada right now, our distribution looks like this:
* the top 10% owns 58.2% of the wealth, up from 51.7% in 1984, and it's largely in businesses and enterprises
* the middle 40% owns 38.6%, down from 43% in 1984, and it's mainly in their own homes
* the bottom 50% owns 3.2% of the wealth, down from 5.3% in 1984