The capital cities of Italy, Switzerland, and Germany have a minor economic influence, representing less than 10% of the GDP. In contrast, in larger countries like Iceland, the Baltic nations, and Croatia, the capital cities play a significant role, contributing to over half of the country's GDP.

While not depicted on the map, Moscow stands out with a GDP share of approximately 20% of Russia's total GDP, positioning it within the average range compared to most Eastern European countries and France.