Originally Posted by
cmn.jcs
What's the reason for that?
The new $100 bills are considered better protected from counterfeit confusion than the other versions of the $100 bill; and it is better protected from counterfeit confusion than the $50 or $20 bills; and also smaller bills being a smaller store of value means more volume for any given large value.
If volume is the issue, the 500 euro note is more efficient than $100 US notes.