We're talking about should we increase taxes? Why not put a tax on carbon emissions. It would raise a lot of money, it would reduce the environmental damages in the future, it would solve so many problems, and it would be a much more constructive thing to do than to think about raising the income tax.

When large companies take on risk, then they impose risks on the rest of the system. And these are systemic risks and these systemic risks we never used to think were really that important, but as soon as we recognize how the financial sector - the risks the financial sector takes on can impact the entire global economy, we realize that those risks needed to be controlled for the social good.

Credit default swap gives you something to do. You can buy some credit default swaps from them to protect yourself against the bankruptcy of people who owe you money.

I think that's something that investment banks have worried about for a long time and are continuing to worry about, but it's not an easy solution when you have lots of people betting the company's money, how do you really allocate those risks? How do you make sure that the people that take the risks are feeling the risks in an appropriate kind of fashion?

I mean, we've always had gold bugs, but now we sort of realize that Treasure Bills might be in the same category. And we have derivatives like credit default swaps which are in this category, and we have derivatives like volatilities that are actually an asset class that we can invest in which are now - would out perform if we have another financial crisis.

I agree with a lot of the points in Taleb's book, but I don't agree with many of his conclusions. It seems to me that he rightly points out that risk managers miss a lot of the risks, but the conclusion is that he draws, is that we should abandon risk management, whereas my conclusion is we should improve it.

If you have information that a company is not as good as its stock market valuation, you don't have a way to sell that stock unless you already own it. And so that information doesn't get incorporated in the company's stock price as fast if you don't allow short selling.