In which country did The Economist's Big Mac Index consistently show the most undervalued currency relative to the U.S. dollar over the past decade?

The Economist's Big Mac Index has been used since 1986 as an informal way to measure purchasing power parity (PPP) between currencies. This 'burgernomics' approach compares the relative cost of the same product (a McDonald's Big Mac) across different countries, revealing insights about currency valuation, market pricing strategies, and economic differences. Test your knowledge about this fascinating intersection of geography, economics, and product pricing!

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Russia
Switzerland
Japan
Brazil