Theories of international relations

Liberalism/idealism/Liberal Internationalism

Liberal international relations theory arose after World War I in response to the inability of states to control and limit war in their international relations. Early adherents includeWoodrow Wilson and Norman Angell, who argued vigorously that states mutually gained from cooperation and that war was so destructive to be essentially futile.

Liberalism was not recognized as a coherent theory as such until it was collectively and derisively termed idealism by E. H. Carr. A new version of "idealism" that focused on human rights as the basis of the legitimacy of international law was advanced by Hans Köchler.

Neoliberalism

Neoliberalism seeks to update liberalism by accepting the neorealist presumption that states are the key actors in international relations, but still maintains that non-state actors (NSAs) and intergovernmental organizations (IGOs) matter. Proponents such as Maria Chattha argue that states will cooperate irrespective of relative gains, and are thus concerned with absolute gains. This also means that nations are, in essence, free to make their own choices as to how they will go about conducting policy without any international organizations blocking a nation's right to sovereignty.

Neoliberalism also contains an economic theory that is based on the use of open and free markets with little, if any, government intervention to prevent monopolies and other conglomerates from forming. The growing interdependence throughout and after the Cold War through international institutions led to neo-liberalism being defined as institutionalism, this new part of the theory being fronted by Robert Keohane and also Joseph Nye.

Regime Theory

Regime theory is derived from the liberal tradition that argues that international institutions or regimes affect the behavior of states (or other international actors). It assumes that cooperation is possible in the anarchic system of states, indeed, regimes are by definition, instances of international cooperation.

While realism predicts that conflict should be the norm in international relations, regime theorists say that there is cooperation despite anarchy. Often they cite cooperation in trade, human rights and collective security among other issues. These instances of cooperation are regimes. The most commonly cited definition of regimes comes from Stephen Krasner. Krasner defines regimes as "institutions possessing norms, decision rules, and procedures which facilitate a convergence of expectations."

Not all approaches to regime theory, however are liberal or neoliberal; some realist scholars like Joseph Greico have developed hybrid theories which take a realist based approach to this fundamentally liberal theory. (Realists do not say cooperation never happens, just that it is not the norm; it is a difference of degree).