Quote from S2007S:
The NASD, a brokerage regulator, recently sent out an "alert" to investors outlining the risks associated with margin. Through the end of March, the latest data available, the amount of debt taken on by investors to buy stocks totaled $317.7 billion. And while that was a bit below the $321.2 billion record hit in February, it still surpasses the $300 billion in March 2000 at the top of the tech-stock bubble.