Originally posted by Temujin
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Given the market frictions I mentioned the market will not correct in a nano second it will take time- perhaps only 1 second but time, however, if the market is suspended before that time then prices will not have fully moved. If only a select (super fast) few get their orders into the market before betfair suspends it is then possible (not guaranteed) that prices may only move a few ticks. Surely you must agree that is plausible? And the problem of greening has been conveniently overlooked.
I am not stating this is what happens always- simply, that on occasion there are possible reasons for the market to only move a few ticks before it is suspended. ie. a lucky few who are faster than everybody else got a few bets on before the market was suspended.
But as I stated previously this is nothing but opinion with no empirical evidence to verify- the closest I can offer to empirical results regarding betfair prices movement when goals are scored is the paper titled "The Role of Surprise: Understanding Overreaction and Underreaction to Unanticipated Events using In-Play Soccer Betting Market" by Choi and Hui. It is worth a read as it does highlight some market inefficiencies occur. To reinforce the point that market frictions occur I refer you to the paper "How quickly is temporary market inefficiency removed?" by Marshall which shows that arbs may exist for many hours. But how can that be? that is just free money lying around? Again because of market frictions.
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