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Food prices, too, are on the honor system. Diners typically pay around 10 to 15 euros for an entree, salad and a few glasses of wine. These wine bars — all based on an honor system — have a charming, if maybe a bit naïve, faith in mankind’s honesty. For the price of 1 euro (about $1.50), you rent yourself a glass and get to sample as many of the wines as you want. At the end of the night you throw some bills or coins into a big jar, the amount based on what you think is fair.