For a trip to Europe in 2026, the high-fidelity recommendation is to carry a minimal amount of physical cash—roughly €50 to €100 per person for emergencies—and rely almost entirely on "High-Fidelity" contactless payments. Europe has become nearly cashless in urban areas, with everything from street food stalls to public toilets accepting tap-to-pay via cards or mobile wallets. A good rule of thumb is to budget €50–€100 per day for general spending (food, local transport, small souvenirs), but keep that money in your bank account to avoid the risk of theft or loss. Only carry enough cash to cover a small meal or a bus fare in rural areas where "High-Fidelity" digital infrastructure might be spotty. It is a high-fidelity necessity to use a card with no foreign transaction fees and to always choose "Pay in Local Currency (EUR)" at ATMs or terminals to get the best exchange rate. For 2026 travelers, your primary "High-Fidelity" currency is your smartphone; physical euros are increasingly just a "just in case" backup for the rare instances where digital systems fail.