Suppose that the speed limit on a four-lane highway is 60...

Suppose that the speed limit on a four-lane highway is 60 miles per hour. An accident has occurred in the southbound lanes, and people in the northbound lanes tend to slow down and look at it. This reduces the speed in the northbound lanes from 60 to 40 miles per hour. All the people in the northbound lanes are on their way to work and are driving 40 miles. If they agree not to slow down, they can get to work in 40 minutes. However, if they slow down, the trip will take 60 minutes. The people in the northbound lanes all obtain private satisfaction from slowing down and looking at the accident. a) Will an informal agreement not to slow down be stable? b) What is the externality in this situation?

Suppose that the speed limit on a four-lane highway is 60 miles per hour. An accident has occurred in the southbound lanes, and people in the northbound lanes tend to slow down and look at it. This reduces the speed in the northbound lanes from 60 to 40 miles per hour. All the people in the northbound lanes are on their way to work and are driving 40 miles. If they agree not to slow down, they can get to work in 40 minutes. However, if they slow down, the trip will take 60 minutes. The people in the northbound lanes all obtain private satisfaction from slowing down and looking at the accident.
a) Will an informal agreement not to slow down be stable?
b) What is the externality in this situation?

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Key Concepts

Informal Agreements Stability

This concept explores whether individuals have sufficient incentives to adhere to a non-binding agreement when personal benefits exist for defecting. In game theory, informal agreements can be unstable if each individual finds that breaking the agreement yields a personal improvement despite negatively affecting the group. The tension between individual incentives (such as gaining private satisfaction) and collective welfare often leads to a situation where the agreed behavior is not self-enforcing, which is central to many coordination problems in economic and social settings.

Externality

An externality arises when the actions of an individual impose costs or benefits on others that are not reflected in the market transactions or personal decision making. In scenarios of traffic congestion or delayed commute times, the private benefit of enjoying a slower pace (such as the opportunity to view an accident) inadvertently creates additional delays for others. This negative spillover effect means that while the individual may gain satisfaction, the overall social cost is higher, making externalities a fundamental concept in discussions of inefficiency and the need for potential regulation or intervention.

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