Others worried about the hyperactivity of high-frequency traders have suggested charging them for each trade they break, although that would not necessarily improve liquidity and is an idea that is unlikely to be pursued.

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In Las Vegas casinos, for instance, hourly breaks are often built into shifts, because health research shows that a higher frequency of short breaks can be more beneficial than just one long break.

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That contrasts with the average of 250 shares on exchanges where institutions break big order into slivers to avoid moving the markets or getting played by high frequency traders.

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