The Tokyo Stock Exchange suffered its worst-ever technical failure when a programming bug in the computerized trading system shut down the entire system throughout early August 1.
The crash set off a flurry of sales that sent the Nikkei average plunging to 19804.38, down 527.05 from July 31. It marked the first closure below 20,000 since July 11. Exchange officials initially could not identify the cause, But by late afternoon, the breakdown was traced to a bug in the software that handles trading for foreign section issues.
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