Modern monetary units are rarely backed by physical gold or silver; instead, they exist as , valued because of government decree and their use in paying taxes.
: Despite being called "paper money," U.S. bills are actually a blend of 75% cotton and 25% linen . monetary unit
: The $5 bill is the most "hard-working," with the shortest average lifespan of only 4.7 years due to frequent use. 2. Global Curiosities & Origins Modern monetary units are rarely backed by physical
: A standard $1 bill is designed to survive roughly 4,000 double folds before tearing. they exist as