There is a widely held view that breach of contract is immoral. Yet it is manifest that legal systems ordinarily do allow breach – the law usually permits breach if the offending party pays damages – and it is a commonplace that breach occurs. Thus, a tension exists between the felt sense that wrong has been done when contracts are broken and the actual operation of the law. This opposition has long been remarked by commentators.

Recently I wrote on the question of when breach of contract should be considered immoral. My primary point was that breach may often be seen as moral once one appreciates that contracts are incompletely detailed agreements and that breach may be committed in problematic contingencies that were not explicitly addressed by the governing contracts. In other words, because of contractual incompleteness, it is a mistake generally to treat a breach as a violation of a promise that was intended to cover the particular contingency that eventuated.