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 nostr:nevent1qvzqqqqqqypzqx78pgq53vlnzmdr8l3u38eru0n3438lnxqz0mr39wg9e5j0dfq3qqsqfkr2caw04ztv5arzwr4wt8ec0wqtweuq964qkqly3wcxd666gng5mtl0y

With the average lifetime of any fiat currency being 27 years there is no way around replacing the currency or reforming it since it has lost at least 50% of it's value at 2% inflation p.a. So yes, new banknotes are a built-in feature for any currency since none of them is designed to succeed.
 https://image.nostr.build/f572316c9e55e0310f02664e63eeb5fb792dd6b96c792ba9c1538447bc424b25.jpg 
 What about when the denominations don’t change 
 I guess in that case Diego's comment comes into play. New anti-forgery techniques etc. Not that any of those would really work. The only currency without counterfit money in circulation is Bitcoin.