And the fact that we have an investigation by a two-star Army general into how this was reported tells you that there's a serious problem there.

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The circuit breakers successfully prevented a serious problem from growing into another flash crash, but their effects on the markets are very disruptive.

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That would be South Korea, where gaming addiction is a serious problem among youths, so much so that last year a ban went into effect which does not allow kids under the age of 16 to game online between 12 AM and 6 AM in order to force them to get some sleep.

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This takes us into serious crunching - and we have to look to people who've studied the problem on a big scale.

BBC: Crashes