Raising margin requirement seeks to solve or in this case stem an immenent problem. The Fulfillment of physical silver. CME mandate is to facilitate the delivery of physical silver to the owner of those futures contract. While traditionally, contracts have been rolled over, December saw a different outcome. 60% of the expired contracts sought For delivery instead of rollover. So now what? Expect more CME intervention to stem runaway silver prices while they bolster their inventory. I am still of the view that silver will climb.