crash" that wiped US$1 trillion in shareholder equity before bouncing

back is still unknown, but plenty of fingers have been pointed at

possible culprits for this electrifying event. Aiming to avoid a repeat,

securities exchanges around the world now are following the lead of the

US regulator by bringing on circuit breakers. Michael Aitken, chair of

Capital Market Technologies at the University of New South Wales, says

there's no evidence to support market design changes soon expected to be

introduced in Australia. While gathering evidence is costly, he argues,

it's the best way to stop future shocks.