Law
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* Unjust enrichment When someone has been unjustly enriched (or there is an "absence of basis" for a transaction) at another's expense, this event generates the right to restitution to reverse that gain.
* Tax law involves regulations that concern value added tax, corporate tax, income tax.
* Banking law and financial regulation set minimum standards on the amounts of capital banks must hold, and rules about best practice for investment. This is to insure against the risk of economic crises, such as the Wall Street Crash of 1929.
* Regulation deals with the provision of public services and utilities. Water law is one example. Especially since privatisation became popular and took management of services away from public law, private companies doing the jobs previously controlled by government have been bound by varying degrees of social responsibility. Energy, gas, telecomms and water are regulated industries in most OECD countries.
* Competition law, known in the U.S. as antitrust law, is an evolving field that traces as far back as Roman decrees against price fixing and the English restraint of trade doctrine. Modern competition law derives from the U.S. anti-cartel and anti-monopoly statutes (the Sherman Act and Clayton Act) of the turn of the 20th century. It is used to control businesses who attempt to use their economic influence to distort market prices at the expense of consumer welfare. In general, legal systems can be split between civil law and common law systems. The term "civil law" referring to a legal system should not be confused with "civil law" as a group of legal subjects distinct from criminal or public law. A third type of legal system— accepted by some countries without separation of church and state—is religious law, based on scriptures. The specific system that a country is ruled by is often determined by its history, connections with other countries, or its adherence to international standards. The sources that jurisdictions adopt as authoritatively binding are the defining features of any legal system. Yet classification is a matter of form rather than substance,
* Consumer law could include anything from regulations on unfair contractual terms and clauses to directives on airline baggage insurance.
* Environmental law is increasingly important, especially in light of the Kyoto Protocol and the potential danger of climate change. Environmental protection also serves to penalise polluters within domestic legal systems.
Legal systems