Wall Street’s wisdom: “These computers go out and just find the next bid they can find”

Duncan L. Niederauer, chief executive of NYSE Euronext, blaming Nasdaq’s computers for continuing trading while the market was in free fall. “These computers go out and just find the next bid they can find,” he said. Mr. Niederauer acknowledged the need to introduce circuit-breakers along the lines of those already in place on the Big Board, and his views were echoed by some chief executives of the new exchanges.