Quote:
Originally Posted by davew
They jump around because some people play the moves. Say early in betting you can back at 3.00 for $10 and during betting can lay at 2.00 for $10 they have made $10. A great exercise for people who like to dutch and/or know there will be late money on a favorite that has not showed up on the exchange yet.
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Actually, the jumping appears to be nothing more than a glitch. If you check the international exchange, the number always appears stable and moves only up. The USA display seems to bounce up and down for some reason, most likely a programming error. When people trade out, it does not reduce the volume, it actually increases it. For instance, if I back a horse for $20 and you lay the full amount, $40 is added to the volume. 1 minute later, if we do it in reverse and I lay and you back the same horse you just layed for another $20, another $40 is added to volume. So you have $80 of volume with no outstanding positions. That is another reason the exchange liquidity can look higher than it really is.