Let me address that with a brief point.
One thing that's really interesting is that there has been a rise in income inequality in Canada over the past 25 years, but a lot of that is driven not by changes in capital income but by changes in earned income. People at the very top of the wage distribution of earned income have done very well over the last 20 years. People even at the 90th percentile of the earnings distribution have actually been pretty flat over the last 20 years; it's really the top 1% who have done very well.
My point about the dual income tax is that if you're really concerned about equity and this inequality problem, this approach might allow you to address it through a system that allows you to separate out the capital income side from the earned income side, because the earned income is actually the source of the greatest growth in inequality.