US $1 bills have a short life before the paper they're printed on wears out. Constantly replacing paper currency costs tax dollars. Australia and many other countries have switched in whole or in part from paper to polymers, such as BOPP, something tough and similar to Tyvek. Direct the Treasury to switch high-use denominations such as $1 bills to a polymer and avoid needless waste of tax dollars. For additional background info see "polymer banknotes" on Wikipedia.
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