The €500 Euro note is still in circulation, but not for long...

Should America ever need to buoy the value of the US dollar, it could start re-issuing $500 bills;
what else are narco-terrorism groups going to use for transporting large amounts of currency?
Apparently the €500 Euro note is currently the note of choice thanks to its value.

Hey America!
Want to raise the value of the dollar?
Issue hundreds of billions worth of $500 bills - You can bet they'll be bought up around the world in no time as a false store of value (think Weimar Republic type hyper-inflation, eventually).
We can stretch this party out a little further, until contending with the financial reckoning that's 2 generations overdue...