Crossed/Locked Markets? Do they happen a lot?

I was reading about crossed/locked markets during the flash crash and was just wondering, do crossed markets happen a lot between exchanges, such as between BATS and NASDAQ?

Obviously, crossed markets get corrected almost instantaneously but I was wondering if it was a common enough occurrence that some firms make money off of it by arbitraging

5 Comments
 

Thanks for the responses.

Do you guys subscribe to some sort of Level 2 quotes? Is there a way to watch this stuff without being at a firm? Obviously as an independent trader, you probably aren't fast enough to act on a crossed/locked market but it would still be interesting to see it happen.

 

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