'The Brokerage Defendants tell this Court that they were not enriched because, they allege, their customers also received funds; but this suggestion is flatly wrong, because, in addition to being directly enriched by receiving funds to which they did not have a right to in the first instance, it is plausible that the Brokerage Defendants were indirectly enriched by the receipt of these funds (for example, through float on the principal sums, through transaction fees, and to the extent the due bill payment satisfied customers’ debts to the Brokerage Defendants).'