So you are talking about fixed odds on quinella. (Re percentages)

But this would not be so on TAB payouts because the odds fluctuate prior to start of race and even after the start of race the late money affects odds as well.
One could make an allowance prior to bet of a price drop but even then this can bring a downfall if the late plunge is huge.
How many times has a runner been shown to pay 8.00 and ends up paying far less ?
I am not doupting your comment, but trying to sort out this percentage factor you say on quinella/hedge. It makes no sense to "hedge a quinella".
1st and 2nd is 1st and 2nd and bet the field or part of cannot be hedged on quinella.
Differant if hedge 2, 3 or more for win, that I understand.
But hedge quinella, sorry but I don't see it.