I'll always understand the Schadenfreude aspect to short-selling. I get that no one will always like it. I'm also convinced to the deepest part of my bones that short-selling plays the role of real-time financial watchdog. It's one of the few checks and balances in the market.

So you know, everyone points out Greece's default record, but the history of a lot of sovereign nations is not a good one when it comes to lending them money.

Derivatives in and of themselves are not evil. There's nothing evil about how they're traded, how they're accounted for, and how they're financed, like any other financial instrument, if done properly.

I used to think that good short-sellers could be trained like long-focused value investors because it should be the same skill set; you’re tearing into the numbers, you’re valuing the businesses, you’re assigning a consolidated value, and hopefully you’re seeing something the market doesn’t see.But now I’ve learned that there’s a big difference between a long-focused value investor and a good short-seller. That difference is psychological and I think it falls into the realm of behavioral finance.

It's very difficult in the technology space when you have been leapfrogged to prosper again.

What we define as a bubble is any kind of debt-fueled asset inflation where the cash flow generated by the asset itself - a rental property, office building, condo - does not cover the debt incurred to buy the asset. So you depend on a greater fool, if you will, to come in and buy at a higher price.

Healthcare is growing now at about 10 per cent per annum in the U.S. top line, versus 3 per cent for the economy. As someone with a sharp pencil and an eye for this kind of thing, this can't last.