Out of context. I was stating that this method could only truly be used with Betfair. Maybe I should have said Human adjustment. The betfair prices are a result of the market. Two people agreeing to a price subject to the prices being offered. That acceptance does not affect any other price. Whereas if a on course bookie suddenly gets an interest in a horse, he adjusts the market to compensate. Not only does this affect the horse in question, he adjusts some or all the other horses.