I've always wondered this...what is the main currency the humans (or animals) would use in their world? We all know the games are set on an alternate Earth, but would they use rings to buy things, or something else, like Dollars or Pesos? Because what made me think of this was in Sonic Adventure 2, there is a cheeseburger ad, and instead of 99 cents, it has a star icon after the 99. So, much like this $, would the star be the ring's symbol?