Hegemonic stability theory
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Hegemonic stability theory (HST) is a theory of international relations. Rooted in research from the fields of political science, economics, and history, HST indicates that the international system is more likely to remain stable when a single nation-state is the dominant world power, or hegemon. Thus, the fall of an existing hegemon or the state of no hegemon diminishes the stability of the international system. When a hegemon exercises leadership, either through diplomacy, coercion, or persuasion, it is actually deploying its "preponderance of power." This is called hegemony, which refers to a state's ability to "single-handedly dominate the rules and arrangements ...[of] international political and economic relations."
Research on hegemony can be divided into two schools of thought: the realist school and the systemic school. Each school can be further sub-divided. Two dominant theories have emerged from each school. What Robert Keohane first called the "theory of hegemonic stability,"  joins A. F. K. Organski's Power Transition Theory as the two dominant approaches to the realist school of thought. Long Cycle Theory, espoused by George Modelski, and World Systems Theory, espoused by Immanuel Wallerstein, have emerged as the two dominant approaches to the systemic school of thought.
Charles P. Kindleberger is one of the scholars most closely associated with HST, and is even regarded by some as the father of HST. Kindleberger argued, in his 1973 book The World in Depression: 1929-1939, that the economic chaos between World War I and World War II that led to the Great Depression, can be blamed in part on the lack of a world leader with a dominant economy. The theory is about more than economics though: the central idea behind HST is that the stability of the global system, in terms of politics, international law, and so on, relies on the hegemon to develop and enforce the rules of the system.
- 1 Hegemonic rise
- 2 Competing theories of hegemonic stability
- 3 Is the United States of America still a hegemon?
- 4 Gilpin's Argument
- 5 References
- 6 External links
In order for a nation-state to rise to the level of hegemon, there are some attributes it must or is more advantageous to have.
First of all, it must have political strength, military force, and superior national power that is necessary for its ability to forge new international laws and organizations. In terms of military force, a standing defensive army is not enough. A superior navy, or air force is. This explains why many hegemons have been geographically situated on peninsulas or islands. Peninsularity and insularity provide added security, and, where naval power is necessary, the ability to project military forces.
In some cases, hegemons have not been insular or peninsular. The United States of America, for instance, has become a virtual island. It has two massive seaboards, and its neighbors are strong allies, and relatively reliable. Also, the modern invention of nuclear weapons, and the presence of a superior air force provide highly reliable security for the country, setting it apart from the rest of the world.
Secondly, a hegemon must have a large and growing economy. Usually, unrivaled supremacy in at least one leading economic or technological sector is necessary.
Thirdly, a hegemon must have will to lead, and the will to establish a hegemonic regime, as well as the capability to lead and enforce the rules of the system. After World War I, Great Britain possessed the will to lead, but lacked the necessary abilities to do so. Without the ability to force stability on the international system, Great Britain was able to do little to prevent the onset of the Great Depression or World War II.
Finally, a hegemon must commit to the system, which needs to be perceived as mutually beneficial for other great powers and important state-actors.
Competing theories of hegemonic stability
Hegemony is an important aspect of international relations. Various schools of thought and theories have emerged in an attempt to better understand hegemonic actors and their influence.
The Systemic School of thought
According to Thomas J. McCormick, scholars and other experts on the systemic school define hegemony "as a single power's possession of 'simultaneous superior economic efficiency in production, trade and finance.'" Furthermore, a hegemon's superior position is considered the logical consequence of superior geography, technological innovation, ideology, superior resources, and other factors.
Long cycle theory
George Modelski, who presented his ideas in the book, Long Cycles in World Politics (1987), is the chief architect of long cycle theory. In a nutshell, long cycle theory describes the connection between war cycles, economic supremacy, and the political aspects of world leadership.
Long cycles, or long waves, offer interesting perspectives on global politics by permitting "the careful exploration of the ways in which world wars have recurred, and lead states such as Britain and the United States have succeeded each other in an orderly manner." Not to be confused with Simon Kuznets' idea of long-cycles, or long-swings, long cycles of global politics are patterns of past world politics.
The long cycle, according to Dr. Dan Cox, is a period of time lasting approximately 70 to 100 years. At the end of that period, "the title of most powerful nation in the world switches hands.". Modelski divides the long cycle into four phases. When periods of global war, which could last as much as one-fourth of the total long cycle, are factored in, the cycle can last from 87 to 122 years.
Many traditional theories of international relations, including the other approaches to hegemony, believe that the baseline nature of the international system is anarchy. Modelski's long cycle theory, however, states that war and other destabilizing events are a natural product of the long cycle and larger global system cycle. They are part of the living processes of the global polity and social order. Wars are "systemic decisions" that "punctuate the movement of the system at regular intervals." Because "world politics is not a random process of hit or miss, win or lose, depending on the luck of the draw or the brute strength of the contestants," anarchy simply doesn't play a role. After all, long cycles have provided, for the last five centuries, a means for the successive selection and operation of numerous world leaders.
Modeslki used to believe that long cycles were a product of the modern period. He suggests that the five long cycles, which have taken place since about 1500, are each a part of a larger global system cycle, or the modern world system.
Under the terms of long cycle theory, five hegemonic long cycles have taken place, each strongly correlating to economic Kondratieff Waves (or K-Waves). The first hegemon would have been Portugal during the 16th century, then the Netherlands during the 17th century. Next, Great Britain served twice, first during the 18th century, then during the 19th century. The United States has been serving as hegemon since the end of World War II.
The traditional view of long cycle theory has evolved somewhat, as Modelski now suggests that Northern and Southern Sung China, Venice and Genoa were each the dominant economic powers during medieval long cycles. However, he does not classify any of these states as world powers. Only when Portugal gained hegemony after 1500 is that distinction made.
Other views of hegemonic stability
The neorealist interpretation of hegemony
Neorealists have been focusing on this theory recently, the main proponent of it being John J. Mearsheimer who is trying to incorporate it into 'offensive realism'. In his book 'The Tragedy of Great Power Politics' Mearsheimer outlines how the anarchic system that neorealists subscribe to (see Kenneth Waltz for original theory) creates power hungry states who will each attempt to install themselves as regional and global hegemons. His theory is not widely embraced by fellow realists who argue that the hegemon supports the system so long as it is in their interests. The system is created, shaped and maintained by coercion. The hegemon would begin to undermine the institution when it is not in their interests. With the decline of a hegemon, the system descends into instability. Other realists argue that the anarchic system does not actually give causal motivation to aid the creation of hegemons.
The neoliberal interpretation of hegemony
Neoliberals argue that the hegemon wishes to maintain its dominant position without paying enforcement costs, so it creates a system in which it can credibly limit the returns to power (loser doesn't lose all) and credibly commit to neither dominate nor abandon them. This is done through institutions, which are sticky, (hard to change, more convenient to continue using than to revamp.) These institutions favor the hegemon, but provide protection and a stable world order for the rest of the world. The more open this world-order, the less likely that there will be a challenger.  With the decline of the hegemon, institutions don't automatically die, because they were constructed in a way that benefited all stakeholders; instead, they take on a life of their own (see regime theory). 
The classical liberal interpretation of hegemony
It is motivated by 'enlightened self-interest'; the hegemon takes on the costs because it is good for all actors, thereby creating stability in the system, which is also in the interests of all actors.
Duncan Snidal argues that 'the range of the theory is very limited to very special conditions,' and suggests that the decline of a hegemonic power may demonstrate the possibility of a collective power. According to Snidal, the applicability of the theory can be challenged due to limitations and the theory only holds true empirically under special conditions.
Is the United States of America still a hegemon?
Hegemony demands power, which is defined by Susan Strange as the ability of one party to affect outcomes such that their preferences take precedence over the preferences of other parties. The question of whether the U.S. is still a hegemon is tied into whether or not it has lost power. Keohane sees power as tied into resources and production. The US GDP is now lower relative to others as there are growing economies with considerable amount of GDP such as BRIC countries. This implies a loss or decreased power of US as a hegemon.
Although resources are an important determinant of power, they are not always determinative. For example, the German troops that conquered western Europe were actually fewer in number than their opponents. Susan Strange uses this logic to argue that the U.S. is still a hegemon.
One form of power that the U.S. possess is structural power. After the Exxon Valdez accident, the US passed a domestic law commanding any oil delivery ship to have unlimited liability insurance. Even though most oil shipping companies are located overseas, they nevertheless complied with the law because the US is world's largest market for oil. This non coercive or attractive form of power is key to Keohane and Nye's concept of Soft Power.
In addition to structural power, the U.S. has many resources. It unilaterally helped Mexico in the Peso Crisis and unilaterally helped Russia with economic aid. The United States has also been influential in moving many countries towards embracing the free market; through institutions such as the International Monetary Fund, the United States has pushed Latin American nations to undertake economic programs in accordance with its own foreign policy Interests (see Washington Consensus).
This argument opposes balancing and the Balance of Power Theory. His theory targets the system by analysis. He contends that the system naturally goes toward equilibrium. To acquire a new system, global war or "hegemonic war", definitionally creates a new hegemon. This new hegemon will create the new system of the world with their own set of preferences. Similar to a global war, the hegemon's job is to keep their newly founded order. They accomplish this by providing public goods; examples include the United States attempts at initialising a stable currency by means of the IMF, use of the gold standard, establishment of the World Bank, world defence (NATO), and democratisation. These are norms that the U.S. have shown preference towards and have spent the past several decades demonstrating their new system.
Gilpin argues further that by the global system, the more decisive a victory is after the "hegemonic war", the more stable the new system will be. He agrees with Paul Kennedy's claim of "imperialistic overstretch" being one of the reasons that hegemons fall. Gilpin adds that all hegemons inevitably fall because it is difficult to stay as hegemon. To exemplify this concept, if one were to walk into a weight room with robust men at their prime on one side of the room facing men who are working to reach the equivalent of the robust men, they will see that the working men grow muscle much faster than the already robust men. This is because they have more room to grow. It is harder for hegemons to "grow" when they have already grown and expanded so much.
To ensure their preferences, the U.S. as the newest and current hegemon has created institutions for the system to represent their power structure.
Eventually, Gilpin contends, a dissatisfied great power that approaches the power distribution, approaches the equivalence of the current hegemon will cause a new global war and the cycle repeats. Generally, the rising challenger does not go on to become the new hegemon as most of their resources have been depleted fighting the hegemon and do not have more to spare to instil their preferences. Instead, some theorists think, a state similar in culture and preferences to the old hegemon will assume new hegemon status. 
- Joshua S. Goldstein. International Relations. New York: Pearson-Longman, 2005. 107.
- Joshua S. Goldstein. International Relations. New York: Pearson-Longman, 2005. 83.
- Robert Gilpin. The Political Economy of International Relations. Princeton: Princeton University Press, 1987. 86.
- Terry Boswell and Mike Sweat. "Hegemony, Long Waves, and Major Wars: A Time Series Analysis of Systemic Dynamics, 1496-1967," International Studies Quarterly (1991) 35, 124.
- Helen Milner. "International Political Economy: Beyond Hegemonic Stability," Foreign Policy, (1998)
- Vincent Ferraro. "The Theory of Hegemonic Stability." http://www.mtholyoke.edu/acad/intrel/pol116/hegemony.htm
- Michael C. Webb and Stephen D. Krasner. "Hegemonic Stability Theory: An Empirical Assessment", Review of International Studies (1989) 15, 183–98
- Barry Eichengreen, "Hegemonic Stability Theory and Economic Analysis: Reflections on Financial Instability and the Need for an International Lender of Last Resort" (December 9, 1996). Center for International and Development Economics Research. Paper C96-080.
- Thomas J. McCormick. "World Systems," Journal of American History (June, 1990) 77, 128.
- George Modelski. Long Cycles in World Politics. Seattle: University of Washington Press, 1987.
- Jimmy Myers. "Missouri Western Faculty Discuss Iraq War." St. Joseph News-Press. 2 Mar 2007.
- George Modelski. Long Cycles in World Politics. Seattle: University of Washington Press, 1987, 102
- Mark Rupert. "Hegemonic Stability Theory. http://faculty.maxwell.syr.edu/merupert/Teaching/Hegemonic%20Stability%20Theory.htm
- George Modelski. Long Cycles in World Politics. Seattle: University of Washington Press, 1987, 100, 135 and 227.
- George Modelski. Evolution of the World Economy. https://faculty.washington.edu/modelski/Evoweconomy.html.
- Mearsheimer, John, J. 'The Tragedy of Great Power Politics' W. W. Norton & Company, NYC 2001:1-366
- Ikenberry 1999. Institutions, Strategic Restraint, and the Persistence of American Postwar Order.
- Keohane, After Hegemony, 1984
- Koremenos, Lipson & Snidal
- Snidal, D. (1985). The limits of hegemonic stability theory. International Organization, 39, pp 579-614.