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(BRENDAN MCDERMID/Brendan McDermid/Reuters)

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Share swings are wider in high frequency trading era

Almost twenty years of stock data suggests that innovations in stock trading that have decreased spreads between bid and ask prices have come alongside increased volatility, raising questions about whether the smaller spreads are saving investors money.

The study comes from the capital markets arm of Royal Bank of Canada, which looked at stock ticks for more than 400 stocks since 1996.