Which geographic region is known as the 'Blue Banana' and is famous for retailers implementing premium pricing strategies due to its high population density and wealth?

In the world of retail geography, companies must adapt their pricing strategies to regional economic corridors. One of the most famous economic mega-regions in Europe has a distinctive shape and nickname that influences how products are priced across countries. Test your knowledge about this geographic pricing phenomenon that affects millions of consumers across multiple European nations.

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The curved corridor from Manchester through London, Amsterdam, Brussels, Frankfurt, Zürich to Milan
The Mediterranean coastal region from Barcelona to Rome
The Baltic region connecting Stockholm, Helsinki, Tallinn, and Riga
The Central European region spanning Vienna, Budapest, Prague, and Warsaw