While this increases PM margins again, it is actually the way they should have been doing it all along.  It will make hikes and decreases, automatic as prices rise or fall.  It pretty much removes the old slams and might also temper the intensity of future moves.  Ironically, it is basically closing the barn door after the animals have already left.  If, as I have discussed in recent posts, most of the naked shorts have covered, and open interest is declining, the PM markets are moving more to physical trading and away from paper contract speculation.  The CME is rapidly becoming obsolete for metals trading.                               https://goldseek.com/article/cme-changes-margin-requirement-structure-all-precious-metals-moves-percentage-notional