Regulation creates, limits, constrains a right, creates or limits a duty, or allocates a responsibility. Regulation can take many forms: legal restrictions promulgated by a government authority, contractual obligations that bind many parties (for example, "insurance regulations" that arise out of contracts between insurers and their insureds), self-regulation by an industry such as through a trade association, social regulation (e.g. norms), co-regulation, third-party regulation, certification, accreditation or market regulation. In its legal sense regulation can and should be distinguished from primary legislation (by Parliament of elected legislative body) on the one hand and judge-made law on the other.
Regulation mandated by a state attempts to produce outcomes which might not otherwise occur, produce or prevent outcomes in different places to what might otherwise occur, or produce or prevent outcomes in different timescales than would otherwise occur. In this way, regulations can be seen as implementation artifacts of policy statements. Common examples of regulation include controls on market entries, prices, wages, development approvals, pollution effects, employment for certain people in certain industries, standards of production for certain goods, the military forces and services. The economics of imposing or removing regulations relating to markets is analysed in regulatory economics.
Regulations may create costs as well as benefits and may produce unintended reactivity effects, such as defensive practice. Efficient regulations can be defined as those where total benefits exceed total costs.
Regulations can be advocated for a variety of reasons, including:
Collective desires - regulation about collective desires or considered judgments on the part of a significant segment of society[vague]
Diverse experiences - regulation with a view of eliminating or enhancing opportunities for the formation of diverse preferences and beliefs[vague]
Social subordination - regulation aimed to increase or reduce social subordination of various social groups
Endogenous preferences - regulation intended to affect the development of certain preferences on an aggregate level[vague]
Irreversibility - regulation that deals with the problem of irreversibility – the problem in which a certain type of conduct from current generations results in outcomes from which future generations may not recover from at all. 
Interest group transfers - regulation that results from efforts by self-interest groups to redistribute wealth in their favor, which may be disguised as one or more of the justifications above.
The study of formal (legal and/or official) and informal (extra-legal and/or unofficial) regulation constitutes one of the central concerns of the sociology of law.
Regulation of businesses existed in the ancient early Egyptian, Indian, Greek, and Roman civilizations. Standardized weights and measures existed to an extent in the ancient world, and gold may have operated to some degree as an international currency. In China, a national currency system existed and paper currency was invented. Sophisticated law existed in Ancient Rome. In the European Early Middle Ages, law and standardization declined with the Roman Empire, but regulation existed in the form of norms, customs, and privileges; this regulation was aided by the unified Christian identity and a sense of honor in regard to contracts.:5
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^Levi-Faur, David, Regulation and Regulatory Governance, Jerusalem Papers in Regulation and Governance, No.1, 2010
^McGivern, Gerry; Fischer, Michael Daniel (1 February 2012). "Reactivity and reactions to regulatory transparency in medicine, psychotherapy and counselling". Social Science & Medicine74 (3): 289–296. doi:10.1016/j.socscimed.2011.09.035.Cite uses deprecated parameters (help)