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5. Changes in incentives

Because of the violent nature of the sport, professional American football players are at risk of suffering concussions (or brain injuries) during the

violent collisions that occur between players during the game. Violent collisions involving hits to the head are particularly risky.

Suppose the commissioner of the National Football League (NFL) institutes a rule requiring players to wear a new, lighter helmet that is designed to

reduce head trauma during collisions between players on the field.

While the new helmets

the probability of a concussion resulting from each individual collision, at the same time the new helmets could

also give football players an incentive to play more.

, which could potentially

the amount of violent collisions and thus

the number of concussions suffered by NFL players, all else equal.

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