The bookies set a line on what they consider the score will be
When did they start doing that? They set the line so as to get an equal number of $$$ bet on both sides. They make their money off the "vigorish". That's why sometimes a particular line will change so often as game time approaches.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.