Depends on where you lose it. If it's in/at some place where you can buy something, people usually bring it there and you can get it back as soon as you notice. If it's the whole wallet, it's even easier (would be true for CCs then as well). But yeah, if you don't get it back, then it's gone. But to be honest, if I lose like 100-150€ once in 80 years because of that, then I can take it. I never have more than that in my wallet, unless I intend to buy something. (And that's also another benefit. Cash prevents against impulse buying and you spend your money better (you visually see how it's shrinking etc)).