Marginal benefit is the benefit that a person receives from consuming A. all of the possible units of a good or service that can be consumed. B. only goods and services that are free. C. one more unit of a good or service. D. a good or service until the person has grown tired of it. E. one more unit of a good and is equal to the cost of producing the unit of the

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.