If someone pays good money, for example $280, for a $150 legal banknote which they most likely (say 99.9%) will NEVER use, is it the same as thinking that 99.9% of these banknotes have been burned? How does these affect the bank’s obligation?
(note: burning a legal tender (a banknote) is illegal in many countries)
(By the way, most Post Offices around the world deals with this issue all the time as they frequently issue new stamps and collectors would buy these stamps and NEVER use them. Or will buy the stamps and immediately get the post office to stamp it on the day of their first issue.)