Buffett Says Derivatives Law May Spare Berkshire on Collateral
“If for any reason the Treasury should go back and, in a more sweeping declaration, decide all past contracts be collateralized we would comply, naturally,” Buffett said. “And it will be no problem.”

(Warren, max leverage of about 16 to 1 at the CME would be just about right for you as well. Why don’t you lead by example?)