The capital costs of supermarkets are much, much lower relative to their operating costs. However, using that context: contrast supermarkets with the roads tha

The capital costs of supermarkets are much, much lower relative to their operating costs. However, using that context: contrast supermarkets with the roads that are used by both their suppliers and their consumers, and you have another good example of a capital-intesive infrastructure where redundancy is inefficient and therefore is better supplied by government.