Traders tur ned over an amount equal to a year's GDP in about thr ee weeks. The cost advantage in the upstairs market for buy orders again originates from 22 We consider three proxies for Pd: (a) the mid-point of the quotes 30 minutes before the trade, (b) the mid-point of the closing quotes the day before the block trade (t-1), and (c) the mid-point of the closing quotes three days before the block trade. Finger finders locate these important reversals and advise the swing trader to study the chart under the event.