On the inside front cover of Futures magazine Interactive Brokers show depositing $100,000 and having a total of $500,000 buying power. I haven't been equity trading in awhile, but I thought $100,000 would give you $400,000 buying power, or 4x your balance. Which is correct? I also find their ad interesting from the point of promoting using full buying power and taking out a $400,000 loan. They show taking the money and putting it in dividend earning stocks paying 5% dividends, and that compared with your interest charge gives you a 20% return. All I can say is, mortgage brokers! Didn't we just have this scam in real estate? Of course equities always go up so you never run the risk of a margin call, and I guess you pay no commissions either, or at least not mentioned. Anyway, I found the ad pretty interesting on a couple of levels in light of where our economy is now with people levered up who shouldn't have been in the first place. I can see someone using a 0% credit card deal to jump on this one.