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No matter if you are a newbie in sports betting or have already wagered a decent amount of money for quite some time now, you probably have noticed one thing already – the betting odds always change. Sometimes, it’s just by a few numbers but sometimes, the changes can be so drastic it can turn the tables between the favorites and the underdogs around.

When we’re dealing with bookmakers, we’re always interested in understanding why the odds change. What causes one bookmaker to offer a price on the Lakers winning the Knicks at +150 while another is quite happy to give that same bet away at +215? And a few hours later, each bookmaker’s odds might swap for different ones. What makes bookies change their odds every few minutes?

But why do bookies do this? What is the basis on how much they would tilt the odds to one side? Here are the things you should know.

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There is only one thing that drives the bookies to change their odds: profit. In any game, there will be a 50% chance that each outcome will occur. However, bookies do not need a balanced amount of bets on both sides of the action.


Player Injury Reports

One of the biggest factors in bookies deciding to move the lines is player injury. When a key player on either team gets reported as injured or sustained an injury in their most recent game, that is more than enough reason for bookies to tip the odds to lean on the other side more.

Take for example a game where the Buccaneers would play. Now, Tom Brady has been reported to be injured and unable to play the game. If the Tampa bay team originally stood with an odds of -10, the report of Brady as injured would most likely send the odds slipping down to a -2 or -3 as the public would now less likely favor the team and may switch to the opposing one.

Market Demand

Sometimes, the bookies change the odds based on the sports betting market demand and how punters behave. This is to encourage other bettors to place their wagers on one side rather than the other.

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