I understand that you can get leverage using futures on an index, say SPX, as opposed to just buying SPX. Does that give you free leverage? I.E., instead of having 100% of your account in SPY, could you have [20%] of your account in a long SPX (or SPY I guess) future for the same long exposure, and have the remaining [80%} in an ultra-short bond fund, getting that free interest? I suspect with 99.99% certainty the answer is no, but thought I would ask. I suspect the future pricing will take that "interest" component into account. Thanks!!!