The other doesn't discuss the 'prices' vs 'currency' question which would relate to your sentiment. Recently visited Japan where they have a lot of different coins, 1, 5, 10, 20, 50, 100, 500 yen. We don't talk a lot about dollar coins, but they were there to replace the $1 bill which gets worn out. A $5 coin (like the the 5 L coin in the UK) would be the 'you can get a meal with one coin' coin.