Institution
Definition

There are a variety of definitions of the term institution. These definitions entail varying levels of formality and organizational complexity. The most expansive definitions may include informal but regularized practices, such as handshakes, whereas the most narrow definitions may only include institutions that are highly formalized (e.g. have specified laws, rules and complex organizational structures).

According to Wolfgang Streeck and Kathleen Thelen, institutions are, in the most general sense, "building blocks of social order: they represent socially sanctioned, that is, collectively enforced expectations with respect to the behavior of specific categories of actors or to the performance of certain activities. Typically, they involve mutually related rights and obligations for actors." Sociologists and anthropologists have expansive definitions of institutions that include informal institutions. Political scientists have sometimes defined institutions in more formal ways where third parties must reliably and predictably enforce the rules governing the transactions of first and second parties.

One prominent Rational Choice Institutionalist definition of institutions is provided by Jack Knight who defines institutions as entailing "a set of rules that structure social interactions in particular ways" and that "knowledge of these rules must be shared by the members of the relevant community or society." Definitions by Knight and Randall Calvert exclude purely private idiosyncrasies and conventions.

Douglass North argues that institutions are "humanly devised constraints that shape interaction". According to North, they are critical determinants of economic performance, having profound effects on the costs of exchange and production. He emphasizes that small historical and cultural features can drastically change the nature of an institution. Daron Acemoglu, Simon Johnson, and James A. Robinson agree with the analysis presented by North. They write that institutions play a crucial role in the trajectory of economic growth because economic institutions shape the opportunities and constraints of investment. Economic incentives also shape political behavior, as certain groups receive more advantages from economic outcomes than others, which allow them to gain political control. A separate paper by Acemoglu, Robinson, and Francisco A. Gallego details the relationships between institutions, human capital, and economic development. They argue that institutions set an equal playing field for competition, making institutional strength a key factor in economic growth. Authors Steven Levitsky and María Victoria Murillo claim that institutional strength depends on two factors: stability and enforcement. An unstable, unenforced institution is one where weak rules are ignored and actors are unable to make expectations based on their behavior. In a weak institution, actors cannot depend on one another to act according to the rules, which creates barriers to collective action and collaboration.

Other social scientists have examined the concept of institutional lock-in. In an article entitled "Clio and the Economics of QWERTY" (1985), economist Paul A. David describes technological lock-in as the process by which a specific technology dominates the market, even when the technology is not the most efficient of the ones available. He proceeds to explain that lock-in is a result of path-dependence, where the early choice of technology in a market forces other actors to choose that technology regardless of their natural preferences, causing that technology to "lock-in". Economist W. Brian Arthur applied David's theories to institutions. As with a technology, institutions (in the form of law, policy, social regulations, or otherwise) can become locked into a society, which in turn can shape social or economic development. Arthur notes that although institutional lock-in can be predictable, it is often difficult to change once it is locked-in because of its deep roots in social and economic frameworks.

Randall Calvert defines institution as "an equilibrium of behavior in an underlying game." This means that "it must be rational for nearly every individual to almost always adhere to the behavior prescriptions of the institution, given that nearly all other individuals are doing so."

Robert Keohane defined institutions as "persistent and connected sets of rules (formal or informal) that prescribe behavioral roles, constrain activity, and shape expectations." Samuel P. Huntington defined institutions as "stable, valued, recurring patterns of behavior."

Avner Greif and David Laitin define institutions "as a system of human-made, nonphysical elements – norms, beliefs, organizations, and rules – exogenous to each individual whose behavior it influences that generates behavioral regularities." Additionally, they specify that organizations "are institutional elements that influence the set of beliefs and norms that can be self-enforcing in the transaction under consideration. Rules are behavioral instructions that facilitate individuals with the cognitive task of choosing behavior by defining the situation and coordinating behavior."

All definitions of institutions generally entail that there is a level of persistence and continuity. Laws, rules, social conventions and norms are all examples of institutions. Organizations and institutions can be synonymous, but Jack Knight writes that organizations are a narrow version of institutions or represent a cluster of institutions; the two are distinct in the sense that organizations contain internal institutions (that govern interactions between the members of the organizations).

An informal institution tends to have socially shared rules, which are unwritten and yet are often known by all inhabitants of a certain country, as such they are often referred to as being an inherent part of the culture of a given country. Informal practices are often referred to as "cultural", for example clientelism or corruption is sometimes stated as a part of the political culture in a certain place, but an informal institution itself is not cultural, it may be shaped by culture or behaviour of a given political landscape, but they should be looked at in the same way as formal institutions to understand their role in a given country. The relationship between formal and informal institutions is often closely aligned and informal institutions step in to prop up inefficient institutions. However, because they do not have a centre, which directs and coordinates their actions, changing informal institutions is a slow and lengthy process.

According to Geoffrey M. Hodgson, it is misleading to say that an institution is a form of behavior. Instead, Hodgson states that institutions are "integrated systems of rules that structure social interactions."
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