There is a bit of a problem with the match between derivative securities markets and the primary markets. We have long ago instituted principles, essentially high margin requirements, to prevent certain instabilities in the stock market, and I think they're… — Kenneth Arrow Copy Share Image
If we're talking about buying exchanges abroad, we have to have global securities standards, as we have global banking regulations. I'm talking about margins. Now, the United States has certain margin requirements that are not the same in London. Investors… — Muriel Siebert Copy Share Image
