📈 economics

Diplomatic Capital and Bilateral Economic Performance in the Spain Nigeria Relationship

This paper introduces the Diplomatic Capital Model to explain how the quality of diplomatic missions moderates the conversion of formal treaties into economic outcomes, demonstrating through a Spain–Nigeria case study that deficits in operational diplomatic capital cause investment underperformance and proposing targeted institutional reforms to bridge this gap.

Original authors: Abayomi Ogunrinde, Carmen De-Pablos-Heredero

Published 2026-07-07

📖 6 min read🧠 Deep dive

CC BY 4.0

Original authors: Abayomi Ogunrinde, Carmen De-Pablos-Heredero

Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ✨ This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer

The Big Idea: Why Having a "Friend" Isn't Enough

Imagine you want to do business with someone in a different country. You have a signed contract (a treaty) saying, "We agree to trade fairly." You also have a phone number (an embassy) to call if you have questions.

According to standard economic theory, that contract and phone number should be enough to make trade flow smoothly. But in reality, trade often stalls. The authors of this paper ask: Why?

They argue that it's not just about having an embassy; it's about the quality of the people and systems inside that embassy. They call this quality "Diplomatic Capital."

Think of it like this:

The Contract (BIT) is the blueprint for a house.
The Embassy is the construction site.
Diplomatic Capital is the skill of the foreman, the quality of the tools, and the trust the workers have in the boss.

You can have the best blueprint in the world, but if the construction site is disorganized, the workers don't speak the language, and the tools are broken, the house (the trade deal) will never get built.

The Core Theory: The "Diplomatic Capital Model" (DCM)

The researchers created a model to measure this "quality." They break it down into four ingredients, like a recipe for a successful business relationship:

Human Capital (The Brain): Do the embassy staff know the industry? Do they speak the language? Are they experienced, or are they constantly being replaced?
- Analogy: Hiring a master chef vs. a random intern to run your kitchen.
Relational Capital (The Network): Does the embassy know the right people in the host country? Do they have friends in the government and business sectors?
- Analogy: Having a VIP pass to the back door of a club vs. waiting in line at the front.
Operational Capital (The Tools): Does the embassy have a good computer system to track investors? Do they have a clear process for helping businesses?
- Analogy: A restaurant with a smooth ordering system vs. one where you have to shout your order over the noise.
Reputational Capital (The Trust): Do people believe the embassy will actually help them? Is it seen as a reliable partner?
- Analogy: A mechanic with a 5-star Yelp review vs. one with no reviews.

The Case Study: Spain and Nigeria

The authors tested this theory on the relationship between Spain and Nigeria.

The Setup: Spain is a wealthy European nation; Nigeria is Africa's largest economy. They have a trade treaty and embassies in each other's countries.
The Problem: Trade is happening, but it's much lower than it "should" be based on their economic size.
The Discovery: When the researchers measured the "Diplomatic Capital," they found a huge gap.
- The Spanish Embassy in Nigeria was like a high-tech, well-staffed, well-connected hub.
- The Nigerian Embassy in Spain was like a struggling office: understaffed, lacking computer systems, and disconnected from local businesses.

The Result: Because the Nigerian Embassy lacked the "tools" (Operational Capital) and "knowledge" (Human Capital), Spanish investors didn't know how to use the trade treaty. They were like customers walking into a store, seeing a "Sale" sign, but having no one to tell them what the sale was or how to buy the items.

The "Investment Funnel" Collapse

The paper uses a "funnel" analogy to show where things go wrong. Imagine investors are water flowing through a funnel:

Top of Funnel: Investors ask questions (Inquiries).
Middle: They visit the country (Visits).
Bottom: They actually set up a business (Investment).

The data showed that the Spanish Embassy in Nigeria was great at the top (answering questions) and the middle (hosting visits). But the Nigerian Embassy in Spain had a broken bottom. Even when Spanish companies visited Nigeria, they often failed to set up shop.

Why? Because the Nigerian Embassy didn't have a system to follow up with them. It was a "leaky funnel." The paper argues this leak was caused specifically by the lack of Operational Capital (no computer system to track leads).

The "Activation" Theory

The paper introduces a new idea called BIT Activation.

Old Idea: A treaty works automatically once it's signed.
New Idea (Activation): A treaty is like a key in a locked box. The treaty (the key) is useless unless someone (the embassy) hands it to the right person and shows them how to use it.

If the embassy staff are too busy or don't know the rules, the "key" sits on the shelf. The treaty exists, but it isn't "activated." The study found that Spanish investors in Nigeria often didn't even know the treaty existed because the Nigerian Embassy never told them.

What Can Be Done? (The Fix)

The authors propose three specific, low-cost fixes to "upgrade" the Nigerian Embassy's Diplomatic Capital. They estimate these would cost about €300,000–€400,000 per year (roughly the cost of a few mid-sized office renovations).

Driver's License Swap: Let Nigerians in Spain drive with their Nigerian licenses (and vice versa). This removes a hassle for business travelers.
Digital Paperwork: Create a digital system to verify police background checks instantly, instead of waiting 4–8 weeks for paper stamps.
Fast-Track Visas: Create a special, faster line for business visas so entrepreneurs don't get stuck in bureaucracy.

The Payoff: The authors calculate that fixing these small "friction" points could increase trade between the two countries by €58–€81 million a year. That's a massive return on a relatively small investment.

Summary

This paper argues that diplomacy is not just about waving flags and signing papers. It's about the daily, boring work of having skilled staff, good computer systems, and clear processes.

If you want trade to grow, you can't just sign a treaty. You have to make sure the "shopkeepers" at the embassy have the tools and knowledge to help the customers walk through the door. In the case of Spain and Nigeria, the shop on the Nigerian side was out of stock on tools, and that's why the business wasn't growing.

Technical Summary: Diplomatic Capital and Bilateral Economic Performance in the Spain–Nigeria Relationship

Problem Statement
The paper addresses a persistent anomaly in international economics: why bilateral economic relationships systematically underperform the exchange volumes predicted by economic fundamentals (GDP, distance) and formal institutional infrastructure (treaties, agreements). While existing literature establishes a positive correlation between the existence of diplomatic missions and trade, it relies on a binary measurement convention (mission present/absent) that obscures the critical role of institutional quality. The authors argue that the "diplomatic facilitation gap"—the qualitative variation in the institutional capacity of diplomatic missions—moderates the conversion of formal treaties into realized trade and investment. Using the Spain–Nigeria dyad as a case study, the paper investigates how the quality of diplomatic capital, rather than merely its presence, influences economic outcomes, particularly in high-institutional-distance contexts.

Methodology
The study employs an explanatory sequential mixed-methods design, combining quantitative econometric analysis with qualitative process tracing, consistent with the Beach–Pedersen protocol.

Quantitative Phase: The authors estimate an augmented gravity model on a single-dyad time series (2010–2023). The dependent variable is bilateral merchandise trade (log-transformed), and the key independent variable is the Diplomatic Institutional Quality (DIQ) index. The DIQ is a hierarchical aggregation of four capital components: Human Capital (HC), Relational Capital (RC), Operational Capital (OC), and Reputational Capital (RepC). The authors explicitly note that with $T=14$ and a single dyad, the OLS and PPML estimates provide "proof-of-concept" associations consistent with the model's directional predictions but cannot identify population-average causal elasticities due to the inability to implement full three-way fixed effects or difference out dyad-specific trends.
Qualitative Phase: Structured process tracing is used to test the mechanisms proposed by the Diplomatic Capital Model (DCM). This involves:
- Investment Funnel Analysis: Comparing conversion rates (enquiry-to-visit-to-registration) between the Nigerian Embassy in Madrid and the Spanish Trade Office in Lagos to identify stage-specific bottlenecks.
- Causal Process Observations (CPOs): Three specific observations regarding the Bilateral Investment Treaty (BIT) activation gap (FDI shortfall, zero ISDS proceedings, and investor unawareness of treaty protections) are evaluated against alternative theories (sovereign risk, oil-sector crowding, regulatory instability).
- Regulatory Convergence Analysis: A comparative assessment of joint working groups to determine if regulatory outcomes correlate with a specific "operational-capital threshold" (formal mandate, permanent secretariat, quarterly cadence, direct regulatory linkage).

Key Contributions
The paper makes one primary theoretical contribution and two supporting contributions:

BIT Activation Theory: The authors propose a fourth, mechanism-level explanation for the heterogeneity in Bilateral Investment Treaty (BIT) effectiveness. While existing theories focus on commitment, selection, or thresholds, this paper argues that treaty effectiveness is moderated by the diplomatic infrastructure through which investors learn about, access, and invoke treaty protections. A low-quality diplomatic mission creates an "activation gap" where the treaty exists but fails to generate FDI due to informational and procedural deficits.
Resolution of the Structural Holes Persistence Puzzle: The paper addresses why diplomatic brokerage persists in mature dyads. It posits that unlike geographic distance, institutional distance is continuously regenerated (via regulatory evolution and political transitions), maintaining the "structural holes" that diplomatic missions bridge.
Operational Capital Threshold for Regulatory Convergence: Through comparative evidence, the study identifies a necessary condition for successful regulatory convergence: joint working groups must satisfy a four-feature institutional-design threshold. Groups meeting this threshold achieve convergence; those below it stall, regardless of political salience.

Results

DIQ Asymmetry: The analysis reveals a significant asymmetry in Diplomatic Institutional Quality (DIQ) between the two missions (Spanish complex: 0.79; Nigerian Embassy: 0.32 on a 0–1 scale). The Nigerian Embassy suffers a critical deficit in Operational Capital (OC), specifically the absence of an investor Customer Relationship Management (CRM) system (OC2 = 0).
Trade Association: The augmented gravity models show a positive and statistically significant association between bilateral DIQ and trade volume. The coefficient is higher in the non-oil sub-sample (Model 3: $\beta=0.61$ ) than in the aggregate specification, supporting the hypothesis that diplomatic capital is more critical for information-intensive, differentiated goods.
Investment Funnel Collapse: The investment funnel analysis reveals a disproportionate collapse at Stage 3 (visit-to-representation) for the Nigerian Embassy (17.6% conversion) compared to the Spanish mission (32.8%), despite similar Stage 2 performance. This aligns with the "weakest-link" prediction of the DCM, where the lack of operational systems (OC) specifically hampers the transition from exploratory visits to formal representation.
BIT Activation Gap: The three CPOs support the activation theory: Spanish FDI in Nigeria is significantly below treaty-equivalent benchmarks; there have been zero Investor-State Dispute Settlement (ISDS) proceedings despite potential disputes; and a survey of Nigerian firms revealed 83% were unaware of the BIT's existence. Alternative theories (sovereign risk, etc.) failed to explain the combination of zero ISDS usage and investor ignorance.
Regulatory Convergence: Regulatory outcomes were exclusively concentrated in sub-committees that met the four-feature operational threshold (e.g., Veterinary and Pharmaceutical agreements), while those lacking these features (e.g., Energy, Construction) remained stalled.

Significance and Claims
The paper modestly frames its findings as a "proof-of-concept" demonstration of the Diplomatic Capital Model (DCM) rather than a definitive causal identification. The authors emphasize that the single-dyad design limits the ability to causally identify the moderation claims (the interaction between formal infrastructure and diplomatic capital) across a population.

The significance of the work lies in:

Shifting the Measurement Paradigm: Moving from binary measures of diplomatic presence to a multi-dimensional quality index (DIQ) that captures human, relational, operational, and reputational capital.
Mechanism-Level Insight: Providing a specific mechanism (activation) to explain why formal treaties often fail to yield expected economic returns, suggesting that treaty effectiveness is contingent on the diplomatic capacity to "activate" the treaty for investors.
Policy Relevance: The study proposes three costed institutional reforms (bilateral driver's license reciprocity, a digital apostille bridge, and a consular fast-track visa) estimated to cost €300,000–400,000 annually. A directional calculation suggests these reforms could yield a benefit-to-cost ratio of 150–200:1 by raising the DIQ and subsequently increasing bilateral trade, though the authors explicitly caveat this as an illustrative order-of-magnitude argument rather than a rigorous impact assessment.

The authors conclude that while the Spain–Nigeria evidence is consistent with the DCM, the framework's generalizability requires a future multi-dyad panel study to rigorously test the moderation claims and establish causal identification.