I don't have time to give a thorough explanation, but as has been brought up here and on air several times, the video packages that display odds on screen are directly involved in the appearences of odds increases or decreases.
1.) Odds that the video displays start with the numbers that are an estimated 93% of the pool 30-45 seconds before the start of the race.
2.) There is another tabulation before the gates open which will be the second set of reflected odds displayed on screen and are an estimated 97% of the pool.
3.) The final odds are reflected after the 'flush' 10 seconds into a race.
The changes on screen reflect these snapshots of the odds ONLY IF THERE HAS BEEN A CHANGE IN THE RUNNING ORDER OF THE HORSES. So there is frequently a lag in the odds being reflected.
It's funny how no one ever notes when there are increases in odds on screen. Of course it happens in completely equal proportion to decreases... Happened to bring one up on air a few weeks ago in fact...
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