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NancyLebovitz comments on Avoiding the emergency room - Less Wrong
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I'm not sure why you think you're corrected. Your quote seems to imply that larger cars for safety is defection because they increase safety for their occupants while reducing safety for people in smaller cars.
Yes, but if I'm reading this right, the payoff matrix is different from the PD. If two large vehicles collide, it's about as bad as two small vehicles colliding. This means that if everyone drove a huge truck, safety would be improved overall (trees won't get bigger to match, and no one cares about their safety). If all you care about is safety, the optimal situation is everyone in a large vehicle.
but you have to offset by QUALY's you could have bought with the extra gas money.
And the extra money for the car (larger and heavier tend to be more expensive) and the extra destruction of the environment (when aggregated across everyone who drives)