Theories of International Relations

Introduction

International relations (IR) theories are organized ways of explaining how states, societies, institutions, firms, and individuals interact across political borders. They help analysts answer questions such as: Why do wars occur? Why do states cooperate? How do international rules gain authority? Why do some countries remain economically dependent? How do gender, race, and colonial histories shape global politics?

For students of international business, these questions are practical rather than purely academic. Governments impose sanctions, regulate investment, negotiate trade agreements, protect strategic industries, and manage supply-chain risks. Firms therefore operate within an international environment shaped by power, institutions, ideas, social identities, historical inequalities, and ethical contestation. No single theory explains every situation. The central skill is to identify which assumptions illuminate a problem and which dimensions they leave underexamined.

Learning Objectives

By the end of this chapter, you should be able to:

1. Explain the principal assumptions of realism, liberalism, constructivism, the English School, Marxist and dependency approaches, feminism, and postcolonial theory.
2. Compare how these approaches understand power, interests, institutions, identity, conflict, and cooperation.
3. Evaluate the explanatory value and limitations of each perspective.
4. Apply competing theories to international business and geopolitical cases.
5. Recognize how theoretical assumptions influence managerial and policy decisions.

1. What Is a Theory of International Relations?

A theory is not simply an opinion. It is a structured set of concepts and propositions that helps explain patterns, interpret evidence, and generate questions. Theories simplify reality, but simplification is useful when it identifies relationships that matter.

IR theories differ along several foundational questions:

A useful distinction is between positive and normative analysis. Positive analysis asks what is happening and why. Normative analysis asks what ought to happen and what constitutes justice or legitimate authority. Some theories emphasize one side, but most contain both explanatory and normative elements.

The concept of levels of analysis is also important. An explanation may focus on individuals and leaders, domestic political institutions, or the international system. For example, a trade dispute may be explained by a leader's ideology, by domestic pressure from exporters, or by the distribution of power in the global economy.

2. Realism: Power, Security, and Survival

Realism is one of the oldest and most influential traditions in IR. Classical realists such as Thucydides, Niccolò Machiavelli, and Hans J. Morgenthau emphasized power, prudence, and the recurring struggle for security. Structural or neorealist theorists, particularly Kenneth Waltz, focused on the international system's anarchic structure and the distribution of capabilities.

Core assumptions

Realism generally assumes that:

• The international system lacks a central government capable of reliably enforcing rules; this condition is called anarchy.
• States are the principal actors, especially in questions of war and security.
• States must provide for their own survival through self-help.
• States are concerned about relative gains: who benefits more from cooperation may matter as much as whether both benefit.
• Military and economic capabilities shape the choices available to states.
• Conflict is persistent because uncertainty, fear, and competition cannot be eliminated.

Realists do not necessarily claim that all states are aggressive. Rather, even defensive states may adopt competitive policies because they cannot be certain about others' future intentions. A state may increase military expenditure to become safer, but neighboring states may interpret that increase as threatening and respond similarly. This is the security dilemma.

Classical and structural realism

Classical realism attributes conflict partly to human ambition, fear, and the pursuit of power. Structural realism attributes recurring competition primarily to anarchy and the distribution of capabilities. Offensive realism, associated with John Mearsheimer, argues that great powers have incentives to maximize their relative power where possible. Defensive realism argues that excessive expansion can provoke balancing coalitions and undermine security.

Realism and international business

Realism directs managers to examine geopolitical power rather than treating markets as neutral spaces. A government may restrict exports of advanced semiconductors, screen foreign investment, or subsidize domestic production because it views technological capability as a security asset. A firm dependent on one politically sensitive supplier faces not merely commercial risk but strategic exposure.

Explanatory value and limitations

Realism is strong at explaining arms races, alliance formation, sanctions, rivalry among major powers, and the strategic behavior of states. It reminds decision-makers that legal commitments may weaken when vital security interests are perceived to be at stake.

Its limitations are equally important. Realism may understate the influence of international organizations, domestic politics, transnational firms, public opinion, and norms. It can also treat interests as fixed when they may be socially constructed. It explains competition better than cooperation and has difficulty accounting for deep institutionalized cooperation among states that remain military competitors.

3. Liberalism: Institutions, Interdependence, and Cooperation

Liberal approaches begin from the possibility that international politics need not be a permanent struggle. They emphasize individual rights, economic exchange, domestic institutions, international law, and cooperation. Classical liberal thinkers include John Locke and Immanuel Kant. Contemporary liberal theories include commercial liberalism, democratic peace theory, complex interdependence, and neoliberal institutionalism.

Core assumptions

Liberalism generally holds that:

• Individuals, firms, civil society, and international organizations matter alongside states.
• Domestic political institutions shape foreign policy.
• Economic interdependence can raise the costs of conflict.
• International institutions reduce uncertainty, provide information, monitor compliance, and facilitate repeated cooperation.
• Absolute gains may be more important than relative gains: states may cooperate if all receive benefits, even when benefits are unequal.
• Rules and law can constrain, though not eliminate, the exercise of power.

Neoliberal institutionalism, associated with Robert Keohane and others, accepts the realist premise of anarchy but argues that cooperation is possible when institutions reduce transaction costs, clarify expectations, and create reputational consequences for defection. Institutions do not replace power; they organize its use.

Complex interdependence, developed by Robert Keohane and Joseph Nye, describes relationships characterized by multiple channels of contact, the absence of a strict hierarchy between military and economic issues, and a reduced role for military force in some interactions. Global banking, supply chains, climate governance, and digital networks illustrate this condition, although interdependence can also create vulnerability.

Democratic peace and trade

Democratic peace theory proposes that mature liberal democracies are unlikely to fight wars against one another, although they may use force against nondemocratic states. Commercial liberalism suggests that trade and investment can create mutual interests, but the effect is not automatic. Dependence may generate political resentment, unequal gains, or coercive leverage.

Explanatory value and limitations

Liberalism explains the creation and endurance of institutions such as the World Trade Organization, regional integration projects, investment treaties, and environmental regimes. It is useful for analyzing negotiation, regulatory cooperation, cross-border business networks, and the influence of domestic interest groups.

Critics argue that liberalism may exaggerate the autonomy of institutions and underestimate power asymmetries. Institutions often reflect the preferences of powerful states. Interdependence can also become a weapon: a dominant state may control finance, technology, energy, or market access and use that position coercively.

4. Constructivism: Ideas, Identity, and Social Meaning

Constructivism emphasizes that international reality is socially constructed. States do not respond only to material capabilities; they interpret those capabilities through ideas, identities, norms, and historical experience. Alexander Wendt's well-known proposition that “anarchy is what states make of it” means that anarchy has no single political meaning independent of interaction.

Core concepts

• Identity: A state's understanding of who it is, such as a democracy, regional leader, revolutionary state, or responsible stakeholder.
• Norm: A shared expectation about appropriate behavior.
• Socialization: The process through which actors learn and internalize norms.
• Norm entrepreneur: An actor that promotes a new standard of appropriate conduct.
• Discourse: Language and categories that shape how problems are understood.

Constructivists distinguish between material facts and the meanings assigned to them. Two states may possess similar weapons but be perceived differently because one is a trusted ally and the other a hostile rival. Interests are therefore not always prior to interaction; they can be formed through interaction.

Norms may emerge, cascade through institutions and networks, and become internalized. The global stigmatization of slavery, changing expectations concerning civilian protection, and the spread of anti-corruption standards can be examined through this lens. Constructivists also study how actors contest norms rather than assuming that norms are universally accepted.

Business relevance

Constructivism helps explain why brands, firms, and governments adopt environmental, social, and governance commitments even when immediate legal compulsion is limited. Corporate behavior may be shaped by expectations of legitimacy, responsible investment, human rights due diligence, or membership in a professional community. It also explains why country reputation, historical memory, and national identity influence consumer and investor responses.

Explanatory value and limitations

Constructivism is valuable when material interests alone cannot explain rapid changes in policy, the emergence of new standards, or differences in how similar events are interpreted. It draws attention to language, legitimacy, and identity.

Its challenges include difficulty measuring ideas and establishing causal priority. Critics may ask whether norms changed behavior or merely reflected deeper economic and strategic changes. Constructivist analysis can also become too interpretive if it does not specify mechanisms and evidence.

5. The English School: International Society and Order

The English School occupies a distinctive position between realism and liberalism. It accepts that the international system is anarchic but argues that states form an international society when they recognize common rules, institutions, and practices.

Hedley Bull distinguished among three related concepts:

• International system: States interact and affect one another's decisions.
• International society: States recognize common interests, rules, and institutions.
• World society: Individuals, transnational groups, and humanity as a whole become central units of concern.

The English School identifies primary institutions such as diplomacy, international law, balance of power, great-power management, war, and the practice of international recognition. These are not necessarily formal organizations. They are durable patterns of behavior that help maintain order.

The tradition contains a tension between pluralism and solidarism. Pluralists prioritize coexistence, sovereignty, and non-intervention. Solidarists argue that international society may legitimately enforce common standards, including human rights, even against claims of domestic jurisdiction. This debate is visible in controversies concerning humanitarian intervention, sanctions, and the responsibility to protect.

For business, the English School highlights the social and legal environment in which commerce takes place. Diplomatic recognition, treaty practice, maritime law, sanctions regimes, and accepted standards of state conduct affect market access and corporate risk. Its limitation is that it can be less precise than formal causal theories and may understate the role of capitalism, empire, and material inequality in creating international order.

6. Marxist and Dependency Approaches: Capitalism and Unequal Structure

Marxist approaches interpret international politics through capitalism, class relations, accumulation, and the global organization of production. They argue that states cannot be understood independently of economic structures. Global politics reflects conflicts among classes, firms, and state formations as well as conflicts among states.

Dependency theory, associated with scholars such as Raúl Prebisch, André Gunder Frank, and Theotonio dos Santos, argues that the world economy is structured around a wealthy core and a less industrialized periphery. Peripheral economies may export primary commodities, import manufactured goods, and depend on foreign capital and technology. Such relationships can reproduce vulnerability even when formal colonial rule has ended.

World-systems analysis, associated with Immanuel Wallerstein, distinguishes core, semiperipheral, and peripheral positions and examines long-term capitalist expansion. Neo-Gramscian approaches investigate hegemony: how consent, institutions, and ideas stabilize an order that benefits dominant groups.

Business implications

These approaches direct attention to global value chains, labor conditions, tax competition, intellectual-property ownership, debt, resource extraction, and the distribution of value between producers and lead firms. A product assembled in a low-wage country may generate limited local value while design, finance, branding, and data ownership remain concentrated elsewhere.

Explanatory value and limitations

Marxist and dependency approaches explain persistent inequality, patterns of resource extraction, corporate power, and why integration into global markets can produce both growth and vulnerability. They are particularly useful for analyzing historical structures that realist or liberal theories may treat as background conditions.

Critics note that these approaches may overemphasize economic class and understate security, culture, domestic institutions, and variation among developing states. Dependency is not destiny: some states have upgraded technologically, diversified exports, or used state capacity to alter their position. Contemporary analysis must therefore examine both structural constraints and political agency.

7. Feminist International Relations

Feminist IR asks how global politics is shaped by gendered power relations and how supposedly neutral concepts may reflect masculine assumptions. It does not treat women as a special-interest topic separate from “mainstream” politics; rather, it examines how gender structures security, work, authority, and knowledge.

Key insights include:

• Security includes freedom from domestic violence, sexual violence, poverty, and economic exploitation, not only protection from interstate attack.
• War and militarization depend on gendered divisions of labor and ideas about masculinity, protection, and sacrifice.
• International production often relies on poorly paid and insecure feminized labor.
• Care work, migration, and household survival are connected to global political economy.
• Whose knowledge counts is itself a question of power.

Liberal feminism seeks equal access to institutions. Critical and poststructural feminisms examine the deeper structures and discourses that produce gender hierarchy. Intersectional feminism analyzes how gender interacts with race, class, nationality, sexuality, disability, and colonial status.

For international business, feminist analysis highlights workplace safety, supply-chain labor rights, representation in leadership, unpaid care, migrant labor, and the gendered effects of sanctions or economic crises. Its explanatory value lies in revealing actors and consequences that conventional security analysis may overlook. A limitation is the risk of treating “women” as a uniform category; intersectional analysis is necessary to avoid that problem.

8. Postcolonial Theory: Empire, Knowledge, and Global Hierarchy

Postcolonial theory examines how colonial rule and its legacies shape sovereignty, economic development, identity, knowledge, and international order. Important scholars include Edward Said, Gayatri Chakravorty Spivak, Frantz Fanon, and Dipesh Chakrabarty.

Postcolonial analysis challenges the assumption that European historical experience provides the universal model of modernity. It studies Orientalism, through which the West has represented the East as backward, irrational, or needing control. It also examines how colonial borders, racial hierarchies, language, legal systems, and economic institutions continue to influence contemporary politics.

Postcolonial theory asks whose security is protected, whose history is remembered, and who is authorized to define development or civilization. It is relevant to debates about foreign intervention, aid conditionality, debt, extraction, migration, global governance, and corporate responsibility.

For firms, the approach encourages scrutiny of inherited ownership patterns, local participation, cultural representation, land rights, and the possibility that apparently neutral standards reproduce unequal power. It complements dependency analysis but places greater emphasis on identity, discourse, race, and knowledge.

Its limitations include conceptual breadth and occasional difficulty converting critique into specific predictions. Nevertheless, its challenge to universal claims and Eurocentric categories is essential for responsible international analysis.

9. Comparative Evaluation

The theories can be compared by asking what each makes visible and what it tends to neglect.

These theories are not mutually exclusive in practical research. A study of foreign investment might use realism to analyze strategic screening, liberalism to examine investment agreements, dependency theory to assess value distribution, constructivism to study corporate legitimacy, feminism to examine labor effects, and postcolonial theory to investigate historical patterns of ownership and representation.

10. An Applied Case: Semiconductor Geopolitics

This is an illustrative case based on real-world patterns rather than a single company's confidential experience.

Background

A multinational electronics company sources advanced chips from suppliers in several economies. One government introduces export controls on high-performance chips and manufacturing equipment, arguing that such technologies have military and national-security implications. Other governments respond with subsidies, investment screening, and policies designed to build domestic semiconductor capacity.

Problem

The company must decide whether to retain a highly efficient, geographically concentrated supply chain or diversify at higher cost. It must also comply with export controls, protect intellectual property, maintain relationships with governments, and avoid accusations of contributing to military abuses.

Analysis through competing theories

A realist analysis emphasizes strategic technology, relative gains, dependence, and the possibility that commercial networks can be converted into geopolitical leverage. The company should map exposure to coercion and assess the security policies of major powers.

A liberal analysis examines export-control agreements, standards bodies, trade rules, and the benefits of repeated cooperation. It asks whether transparent rules and reciprocal arrangements can reduce uncertainty and preserve legitimate trade.

A constructivist analysis studies how semiconductors became framed as “critical” or “strategic,” how national identity influences technology policy, and how firms seek legitimacy as responsible corporate citizens.

The English School directs attention to sovereignty, diplomatic practice, international law, and the legitimacy of restricting commerce for security purposes. It also raises the question of whether great powers are managing order or selectively enforcing rules.

A Marxist or dependency analysis examines who owns design capabilities, who captures profits, where labor and environmental costs occur, and whether subsidies deepen technological hierarchy between core and peripheral economies.

Feminist analysis asks how industrial policies affect workers, care economies, migrant labor, and participation in technical leadership. Postcolonial analysis investigates whether technology governance reproduces older patterns in which powerful states define universal security standards and less powerful states bear adjustment costs.

Approach and outcome

A responsible corporate strategy would combine resilience with compliance and ethical review. The firm could:

1. Map suppliers, customers, jurisdictions, ownership, and regulatory dependencies.
2. Classify technologies according to applicable export-control rules.
3. Develop qualified alternative suppliers without assuming that diversification eliminates risk.
4. Establish board-level geopolitical and human-rights oversight.
5. Engage transparently with regulators and industry institutions.
6. Assess labor, environmental, and community effects of new facilities.
7. Maintain scenario plans for sanctions, conflict, shipping disruption, and sudden regulatory change.

The likely outcome is not complete efficiency or complete self-sufficiency but a more resilient portfolio. Costs may increase, yet the company reduces the probability that a single political decision will interrupt production or create legal and reputational exposure.

Learning points

The case demonstrates that theories answer different questions. Realism clarifies coercion and strategic vulnerability; liberalism explains rule-based coordination; constructivism explains changing meanings; critical approaches expose distributional and ethical consequences. A strong business analysis does not choose a fashionable theory. It matches the analytical lens to the decision problem and remains alert to what the lens excludes.

11. Using Theory in Professional Analysis

A practical theory-informed workflow is:

1. Define the issue. Is it a security crisis, regulatory dispute, investment decision, labor problem, or legitimacy challenge?
2. Identify actors. Include governments, firms, institutions, workers, communities, consumers, and social movements where relevant.
3. Map interests and capabilities. Ask who controls markets, finance, technology, information, coercion, and legitimacy.
4. Examine institutions and rules. Identify treaties, domestic laws, standards, sanctions, and informal expectations.
5. Investigate identity and history. Consider nationalism, colonial legacies, stereotypes, and changing norms.
6. Assess distributional effects. Determine who gains, who bears costs, and whether risks are displaced onto weaker groups.
7. Compare explanations. Test at least two theories against available evidence rather than treating one perspective as complete.
8. Make the decision explicit. State the assumptions behind the recommendation and identify uncertainty.

This approach improves employability because international managers must move between strategic, legal, economic, cultural, and ethical reasoning. It also reduces the danger of treating a political problem as a simple market forecast.

12. Contemporary Developments and Limitations

Several developments challenge conventional categories. Digital platforms and artificial intelligence create new forms of power through data, computing capacity, standards, and infrastructure. Climate change blurs the boundary between security, development, economics, and human welfare. Global health crises demonstrate both interdependence and unequal access to essential goods. Supply-chain disruptions reveal that efficiency may create systemic vulnerability.

AI is relevant as an object of geopolitics rather than as a substitute for theory. States compete over chips, data, talent, and standards; firms influence regulation; and algorithms can reproduce racial or gender bias. Realism explains strategic competition, liberalism examines governance institutions, constructivism studies norms of responsible AI, and feminist and postcolonial approaches question whose interests and knowledge shape AI systems.

No theory is value-free. Choices about what counts as security, whose welfare matters, and which evidence is authoritative have ethical consequences. Professional analysis should therefore combine empirical discipline with reflexivity: analysts must state their assumptions, consider marginalized perspectives, distinguish evidence from inference, and avoid presenting historically situated categories as universal truths.

Chapter Summary

International relations theories provide complementary explanations of global politics. Realism emphasizes anarchy, survival, power, and security competition. Liberalism highlights institutions, interdependence, domestic politics, and the possibility of cooperation. Constructivism shows how identities, norms, and discourse shape interests and behavior. The English School explains how states create an international society through rules and practices while debating sovereignty and solidarity.

Marxist and dependency approaches reveal capitalism, class, unequal exchange, and global production structures. Feminist IR exposes gendered power and broadens the meaning of security. Postcolonial theory examines empire, race, knowledge, and the continuing effects of colonial hierarchy. Each approach has explanatory strengths and blind spots. For international business, the most useful practice is theoretically plural: combine lenses, test assumptions, examine distributional effects, and connect geopolitical analysis to responsible decision-making.

Key Terms

Anarchy: The absence of a central authority above states in the international system.

Balance of power: A distribution or policy intended to prevent one state from dominating others.

Constructivism: An approach emphasizing socially constructed identities, norms, and meanings.

Dependency theory: An explanation of persistent underdevelopment through unequal relationships between core and peripheral economies.

English School: A tradition emphasizing international society, common rules, order, and legitimacy.

Feminist IR: Analysis of international politics through gendered and intersectional power relations.

Hegemony: Dominance maintained through a combination of power, institutions, ideas, and consent.

International institution: A set of rules, practices, or organizations that structures international interaction.

International society: States' recognition of common rules, interests, and institutions.

Liberalism: An approach emphasizing cooperation, institutions, rights, interdependence, and domestic politics.

Marxist IR: Analysis centered on capitalism, class relations, accumulation, and structural inequality.

Norm: A shared expectation about appropriate behavior.

Postcolonial theory: Analysis of colonial legacies, race, knowledge, identity, and global hierarchy.

Relative gains: Concern with whether one actor gains more than another from cooperation.

Realism: An approach emphasizing power, survival, security, and competition under anarchy.

Security dilemma: A situation in which defensive measures by one state appear threatening to others.

Self-help: The condition in which states must provide for their own security.

Socialization: The process through which actors learn and internalize norms.

World society: A perspective that places individuals, humanity, and transnational groups at the center of international analysis.

Review Questions

5 Short Answer Questions

1. What does anarchy mean in international relations?
2. Distinguish between absolute gains and relative gains.
3. How does constructivism explain the role of identity?
4. What is the difference between international system and international society?
5. Why do feminist scholars broaden the concept of security?

5 Long Answer Questions

1. Compare classical realism and neoliberal institutionalism in their explanations of international cooperation.
2. Explain the central claims of dependency theory and evaluate its relevance to global value chains.
3. Discuss how constructivism and postcolonial theory challenge materialist explanations of international politics.
4. Analyze the pluralism–solidarism debate in the English School and its implications for humanitarian intervention.
5. Evaluate the usefulness and limitations of feminist IR for analyzing international business.

3 Analytical / Application Questions

1. A government restricts foreign ownership of a telecommunications network on national-security grounds. Analyze the policy using realism, liberalism, and constructivism.
2. A clothing brand shifts production to a poorer country but captures most value through branding and intellectual property. Use dependency, feminist, and postcolonial perspectives to assess the arrangement.
3. Design a theory-informed geopolitical risk assessment for a firm dependent on one country for a critical mineral. State which theories you use, what each reveals, and what evidence you would collect.

Multiple Choice Questions with Answers

Question 1

Which concept refers to the absence of a central authority above states in international politics?

A. Anarchy

B. Hegemony

C. Socialization

D. Solidarism

Correct Answer: A. Anarchy

Question 2

A realist is most likely to explain an arms race primarily through which mechanism?

A. Shared global identity

B. The security dilemma under anarchy

C. The internalization of human-rights norms

D. The equal distribution of economic gains

Correct Answer: B. The security dilemma under anarchy

Question 3

What does neoliberal institutionalism argue about international institutions?

A. They always eliminate power politics

B. They make cooperation impossible under anarchy

C. They can reduce uncertainty and facilitate cooperation

D. They are irrelevant to repeated interactions

Correct Answer: C. They can reduce uncertainty and facilitate cooperation

Question 4

Constructivism emphasizes that state interests are often shaped by:

A. Only military capabilities

B. Identities, norms, and social meanings

C. Geographic size alone

D. Fixed biological instincts

Correct Answer: B. Identities, norms, and social meanings

Question 5

In the English School, international society exists when states:

A. Share a single government

B. Recognize common rules and institutions

C. Abandon sovereignty entirely

D. Avoid all forms of conflict

Correct Answer: B. Recognize common rules and institutions

Question 6

Dependency theory primarily focuses on:

A. Unequal structural relationships in the world economy

B. The biological origins of leadership

C. The disappearance of class differences

D. The irrelevance of trade to development

Correct Answer: A. Unequal structural relationships in the world economy

Question 7

Which question is especially characteristic of feminist international relations?

A. How do gendered power relations shape security and work?

B. How can states maximize relative military gains only?

C. Why are institutions always neutral?

D. Why does colonial history never affect current politics?

Correct Answer: A. How do gendered power relations shape security and work?

Question 8

Postcolonial theory most directly examines the continuing effects of:

A. Colonialism, racial hierarchy, and knowledge production

B. Interest-rate changes alone

C. Purely domestic electoral cycles

D. Mathematical uncertainty in forecasting

Correct Answer: A. Colonialism, racial hierarchy, and knowledge production

Question 9

A firm's dependence on one country for a strategic input is most directly a concern about:

A. Geopolitical vulnerability

B. Norm internalization only

C. Cultural diffusion only

D. Absolute legal sovereignty

Correct Answer: A. Geopolitical vulnerability

Question 10

Why is theoretical pluralism useful in international business analysis?

A. It proves that all theories make identical predictions

B. It allows analysts to examine strategic, institutional, social, and distributional dimensions

C. It eliminates the need for evidence

D. It means no assumptions are necessary

Correct Answer: B. It allows analysts to examine strategic, institutional, social, and distributional dimensions