The United States Dollar is still being used, but it doesn’t hold the prestige it once did. There was a time when you could purchase goods at a great discount if you paid with hundred dollar bills. However, nowadays, merchants will increase their base price and round up figures to give you can even dollar amount. Merchants do not want $5 dollar or $10 bills. Whatever you pay will be rounded to the next $20.
So pay with local currency — or pay with Euros.
Counterpoint: Bring American dollar bills – International travel tip