"The Problem of Social Cost" (1960) by Ronald Coase, then a faculty member at the University of Virginia, is an article dealing with the economic problem of externalities. It draws from a number of English legal cases and statutes to illustrate Coase's belief that legal rules are only justified by reference to a cost–benefit analysis, and that nuisances that are often regarded as being the fault of one party are more symmetric conflicts between the interests of the two parties. If there are sufficiently low costs of doing a transaction, legal rules would be irrelevant to the maximization of production. Because in the real world there are costs of bargaining and information gathering, legal rules are justified to the extent of their ability to allocate rights to the most efficient right-bearer. Along with an earlier article, “The Nature of the Firm”, "The Problem of Social Cost" was cited by the Nobel committee when Coase was awarded the Nobel Memorial Prize in Economic Sciences in 1991. The article is foundational to the field of law and economics, and has become the most frequently cited work in all of legal scholarship. Summary Coase argued that if we lived in a world without transaction costs, people would bargain with one another to produce the most efficient distribution of resources, regardless of the initial allocation. This is superior to allocation through litigation. Coase used the example of a nuisance case named Sturges v Bridgman, where a noisy sweetmaker and a quiet doctor were neighbours and went to court to see who should have to move. Coase said that regardless of whether the judge ruled that the sweetmaker had to stop using his machinery, or that the doctor had to put up with it, they could strike a mutually beneficial bargain about who moves that reaches the same outcome of productive activity. However, many welfare-maximizing reallocations are often forgone because of the transaction costs involved in bargaining. For instance, the sweetmaker may have many neighbors who claim "nuisance" — some legitimate and some not, that the firm would have to sort through, and some of those neighbors who do claim nuisance may try to hold out for excessive compensation. In these cases, the transaction costs eat away, and ultimately eclipse, the price signals that would have led to the most efficient distribution of resources. In cases like these with potentially high transaction costs, the law