From time to time, strong emotional reactions emerge in transatlantic political discourse. These reactions are often framed in terms of “betrayal,” “pressure,” or “coercion.” While such language may resonate rhetorically, it obscures a more fundamental issue: the long-standing imbalance in security provision within the NATO alliance.

To understand why these tensions recur, one must move beyond rhetoric and examine incentives, fiscal realities, and institutional structures.

The Empirical Reality of Defense Burden Sharing

Since the end of the Cold War, the United States has consistently borne a disproportionate share of NATO’s defense expenditures. According to NATO’s own data:

• In 2023, the United States accounted for approximately 68–70% of total NATO defense spending.
• European NATO members collectively contributed roughly 30%, despite having a combined GDP comparable to or even larger than that of the United States.

This imbalance is not new. Throughout the 2000s and 2010s, U.S. defense spending remained above 3.5% of GDP, while many European countries spent significantly less.

The NATO guideline—agreed upon by all members—is that countries should allocate at least 2% of GDP to defense. Yet compliance has historically been limited:

• In 2014, only 3 out of 28 NATO members met the 2% target.
• Even by 2022–2023, after the Ukraine war, fewer than half of the members consistently reached this threshold.
• Major economies such as Germany, Italy, and Spain remained below 2% for extended periods, with Spain often around 1.2–1.4% of GDP.

These figures are not controversial; they come directly from NATO annual reports. The implication is straightforward: the alliance has functioned with a persistent asymmetry in financial and military commitment.

Security as a Public Good and the Logic of Free-Riding

From the perspective of public choice theory, this outcome is entirely predictable. Security within an alliance functions as a public good—non-excludable and non-rivalrous among members. Once provided, all members benefit regardless of their individual contributions.

This creates a classic free-rider problem.

If one actor—the United States—provides a large share of the security guarantee, others face reduced incentives to invest in their own defense. Over time, this leads to structural dependency. Importantly, this is not necessarily the result of bad intentions. It is the logical outcome of institutional incentives.

However, when the primary provider begins to question the arrangement or attempts to rebalance contributions, the reaction is often interpreted as political hostility rather than institutional correction.

Welfare States and Fiscal Priorities

To understand why many European countries have consistently underinvested in defense, one must consider domestic fiscal structures—particularly the expansion of welfare states.

Western Europe allocates a significant share of its GDP to social spending:

• According to OECD data, countries such as France, Italy, and Spain spend between 25% and 31% of GDP on social expenditures.
• By comparison, U.S. social spending is lower relative to GDP, while defense spending is significantly higher.

Budget constraints are real. Governments cannot maximize all categories simultaneously. When welfare spending expands, other areas—such as defense—are often deprioritized.

This has long-term consequences. Defense capabilities require sustained investment, not intermittent adjustments. When spending remains below target levels for decades, capability gaps inevitably emerge.

Incentives, Labor Supply, and Economic Behavior

A related issue concerns how welfare systems shape individual incentives.

In many Western European countries, high marginal tax rates combined with generous social benefits alter the relationship between effort and reward. For example:

• In Spain and parts of Italy, combined marginal tax rates can approach 45–50% for middle-to-high incomes.
• When additional labor effort yields relatively limited net income gains, individuals rationally adjust their behavior.

This does not imply that European workers are inherently less productive or less diligent. Rather, it reflects how institutional incentives shape choices.

Empirical studies from the OECD indicate that:

• Higher tax wedges (the difference between labor costs and take-home pay) are associated with lower labor supply, particularly for secondary earners and high-skilled workers.
• Long-term reliance on state-provided benefits can reduce labor market participation in certain demographics.

Over time, these dynamics influence not only economic growth but also fiscal capacity—including the ability to fund defense.

Strategic Dependence and Political Friction

The combination of free-riding incentives and welfare-state fiscal priorities produces a structural outcome: strategic dependence.

European countries benefit from U.S. security guarantees while allocating a larger share of resources to domestic redistribution. This arrangement can persist as long as the primary provider accepts it. However, once that acceptance weakens, tensions surface.

It is important to emphasize that such tensions are not primarily about personalities or political style. They arise from underlying institutional imbalances.

When expectations diverge—one side expecting continued provision, the other expecting increased contribution—conflict becomes almost inevitable.

Reinterpreting Contemporary Reactions

Expressions of frustration or resentment in transatlantic discourse should therefore be interpreted within this broader context. They are not isolated emotional responses, but reflections of deeper structural adjustments.

For decades, the alliance operated under an implicit understanding: the United States would provide a disproportionate share of security, while European countries would prioritize domestic welfare and economic integration. As this arrangement is questioned, both sides must renegotiate their roles.

This process is inherently uncomfortable. It challenges established expectations and forces a reconsideration of trade-offs that were previously hidden.

Conclusion: Incentives, Not Intentions

The central lesson is that international alliances are governed not only by shared values, but by incentives and resource allocation.

The data are clear:

• The United States has consistently borne the majority of NATO defense costs.
• Many European countries have remained below agreed spending targets for extended periods.
• Welfare-state commitments have shaped fiscal priorities in ways that limit defense investment.

These realities do not imply moral failure. They reflect institutional design.

However, when such imbalances persist, adjustments are unavoidable. The resulting tensions should not be understood solely through the language of betrayal or coercion, but through the lens of incentive realignment.

In international politics, as in economics, sustainability depends on the alignment between costs and responsibilities. When that alignment breaks down, rhetoric intensifies—but the underlying issue remains structural.

And structural problems cannot be resolved by sentiment alone.

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How to Cite this Article (APA 7th edition)

Wang, H. H. (2025, November 26). Burden Sharing, Welfare States, and the Structural Tensions Within the Transatlantic Alliance. [Blog post]. William Hongsong Wang. https://williamhongsongwang.com/2025/11/26/burden-sharing-welfare-states-and-the-structural-tensions-within-the-transatlantic-alliance/