Why small bills take more wear
A dollar bill is built for frequent handoffs. It may move through cash registers, wallets, vending machines, and change-making again and again. Each trip exposes it to folding, friction, dirt, and the occasional tear. The damage is cumulative: a bill does not have to suffer one dramatic accident to become too worn for use.
A $100 bill follows a different route. People are more likely to save it, carry it as a reserve, or use it for an occasional large purchase than to spend it on everyday small transactions. Fewer handoffs mean fewer chances for its paper-and-cotton material to be creased, abraded, or soiled. Its longer life is therefore less about being made indestructible than about being handled less.
What “lifespan” means
The figures describe an average time in circulation, not a timer attached to each bill. A note can leave circulation early if it is damaged, or remain usable longer than the average. Banks and cash-handling systems remove worn notes from the flow and send them for replacement, so the durability of a denomination reflects both how often it is used and how quickly it accumulates damage.
That creates a practical economic difference: replacing a heavily used low-value bill is routine, while a high-value note can keep serving as money for years partly because people treat it as something to hold rather than spend.
