These are the Scotttrade margin interest rates today.
$0.01 - $9,999.99 - 7.75%
$10,000.00 - $24,999.99 - 7.50%
$25,000.00 - $49,999.99 - 7.25%
Until the market discount rate rises significantly above those borrower rates, mass margin calls and a mass meltdown seems imminent.
Here's an interesting link from Ray Dalio's Bridgewater. If you have thirty minutes go ahead and watch it. If you don't have thirty minutes bookmark it and watch when you do.