Bid-ask spreads of 25% are not unknown, says L.E. (Tripp) Dunman, Aquila's director of weather marketing.

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The bid and ask spreads on corporates are prohibitively wide and offerings in size are practically nonexistent.

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In the 1990s it was a playground for securities dealers manipulating bid-ask spreads.

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Prices may range far from their closing NASDAQ prices, with wider bid-ask spreads.

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Early last week, bid-ask spreads on European government bonds from Spain and Italy touched some of their widest levels of the year, said Tradeweb.

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But that assumes the FTT will not simply be passed on to end-customers, either directly by affected institutions or as reduced liquidity leads to wider bid-ask spreads.

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This can be particularly challenging if your stop order triggers during a pre-market session when spreads or the difference between the bid and the ask are wide.

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