If you line races (and you don't even have to make your own line-you can use the final odds/1.17 to get a correct fair odds line and probably would be better for the excercise I am laying out). Calculate the fair exacta prices and fair double prices and look at the final payoffs. Do so on a number of races and you will see betting biases. Which combos are close to fair value, which are far lower? Any paying better? You can probably learn something that will help you make better decisions in the future.
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