Barry Ritholtz of The Big Picture blog is starting to raise some concerns about rising margin debt. I previously asked: Is This Why the Stock Market is Staying Up? I referenced an article that I had seen at Credit Slips (who followed-up on what they had seen somewhere else).
According to Mr. Ritholtz, he has not seen evidence that it has gotten too high -- yet -- "but it getting close," he says.
Anyone who is in the stock market probably needs to take a close look at this phenomenon.