Fallacies in the Interpretation of Social Cost

In his 1924 article, "Fallacies in the Interpretation of Social Cost," economist Frank Knight challenged the idea that traffic congestion justified taxing roads. Knight argued that if roads were privately owned, profits from tolls would naturally reduce congestion, making government intervention unnecessary. This perspective is a key part of modern economic thought.1

The concept of social cost is related to negative externalities, where an action imposes costs on a third party not involved in the transaction. For example, pollution from a factory affects the environment and public health, costs not borne by the factory or its consumers. Cost-benefit analysis attempts to quantify these social benefits and costs in monetary terms, though critics argue this is impossible for all factors.23