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arXiv · 2507.05856

Cutting the Geopolitical Ties: Foreign Exchange Reserves, GDP and Military Spending

Boris Podobnik·Dorian Wild·Dejan Kovac
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Abstract

We show that the amount of foreign exchange reserves (FER) in the world in a given currency is highly correlated with the GDP and military spending of that country for a set of western economies during the last 20 years. Taking into account multicollinearity, Ridge and Lasso regressions reveal that the Foreign Exchange Reserve is better explained by military spending than GDP for seven western currencies. For each year shown, military spending is statistically significant more than the monetary instrument M2. Comparing the currency of the second world economy, the Chinese renminbi, is well beyond the western FER equilibrium, but yearly analysis shows that there is a steady trend towards a new FER balance. Next, we define a complex geopolitical network model in which the probability of switching to an alternative FER currency depends both on economic and political factors. Military spending is introduced into the model as an average share of GDP observed within the data. As the GDP of a particular country grows, so does the military power of a country. The nature of the creation of new currency networks initially depends only on geopolitical allegiance. As the volume of trade with a particular country changes over a designated threshold, a country switches to the currency of that country due to increased trade. If the current steady trend continues within the same geopolitical setting as in the past twenty years, we extrapolate that the RMB and Western currencies could reach a new FER balance within 15 to 40 years, depending on the model setup.

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Boris Podobnik, Dorian Wild, Dejan Kovac. 2025-07-08. Cutting the Geopolitical Ties: Foreign Exchange Reserves, GDP and Military Spending. https://arxiv.org/abs/2507.05856

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