While the dominant topic of conversation when discussing margin hikes (or reductions) usually reverts to silver, ES (stocks) and TEN (bonds), what everyone so far is ignoring is the far more critical topic of real margin risk, in the form of roughly $600 trillion in OTC derivatives. The issue is that while the silver market (for example) is tiny by comparison, it is easy to be pushed around, and thus exchanges can easily represent the illusion that they are in control of counterparty risk (after all, that was the whole point of the recent CME essay on why they hiked...