The CME Group hiked margin requirements four times in two weeks in silver, mandating that people who wanted to trade it needed to post a greater amount of collateral than before.
Second, at least 5 percent of the volume of sales to the allegedly targeted group must be at prices that are lower than the average price of the lowest-priced non-targeted group by a margin (a gap) that is greater than the average gap between the average prices of all the non-targeted groups.