Canada has a tax rate that tops out at 50% (mostly), the US caps out at 37%[1]. I think we'd all be better off if the tax brackets went a lot higher. Rich folks tend to have a lot of inactive money that's just sitting around doing nothing - we can put it to more productive uses.

1. Please note, these numbers are off of raw income tax - both Canada and the US have other employment related taxes that I'm not counting here (like payroll) since their proportional contribution is pretty minimal.