“This structure creates fragility in the system. Often, one sportsbook moves a market based on a bet, and then a large number of sportsbooks will copy that move even though none of their customers made a bet. This behavior means the real market is often much smaller and less liquid than it appears. It also allows savvy bettors to manipulate the market. Worse, it makes game integrity problems harder to spot. The best weapon in defense of game integrity is a large liquid market, where nonsensical movements stick out like a sore thumb.”