So They increase margins on precious metals because of the increased volume, but reduce it on ES, SP and YM for the same reason? How much more obvious can it be that the markets are not moving freely. YM is nearly a 25% decrease in margin while silver was increased by about the same amount in the last raise. Its like they want to start seeing 500 point moves in the dow and S&P again, but only 15 to 25 cent moves in silver. This is a seriously desperate attempt to remove all speculators from silver and into the dow/s&p. This tells you how dire their situation in silver supply must be. http://www.zerohedge.com/article/and-scene-cme-lowers-es-sp-ym-margins
it is not about the volume but the volatility. volatility vs margin of Silver and ES are still out of whack despite the resent increases/decreases by the exchanges/brokers. are you selling calls against your silver position to take advantage of high volatility?