Re: Why would you pay that much negative interest?
Eh, just print one €14.3 billion note and call it a day and enjoy a well deserved beer! :)
The US used to print bills up to $100,000, which weren't circulated but used for transfers between federal reverse branches. So there is some precedent for printing larger notes. Maybe not €14.3 billion large, but I could see an argument for printing €1 million notes for stuff like this. Those would actually be worth less than the $100,000 bills were back when they were used.
Also makes them less likely to be stolen, since they'd be nearly valueless to a thief because who is going to launder those for him?
Biting the hand that feeds IT
