Suppose the extra cost to a city of lowering the speed limits in all school zones by 10 mph is $10,000 per year.Then, the city should lower the school-zone speed limits by 10 mph if doing so results in an additional benefit of less than $10,000 per year.

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If the extra cost of lowering the speed limits is $10,000 per year, it means that the city is spending $10,000 more to enforce the lower speed limits. The decision to lower the speed limits should be based on the overall benefits to the community, such as increased safety for children and reduced accidents. Therefore, if the additional benefit of lowering the speed limit is more than $10,000 per year, the city should still consider implementing the lower speed limits. In other words, the extra cost of enforcement should not be the only factor in the decision-making process.

Suppose the Extra Cost to a City of Lowering the Speed