https://uscurrency.gov/denominations-us-currency
The Seven Denominations
The Federal Reserve Board currently issues $1, $2, $5, $10, $20, $50, and $100 notes.
Meaning that larger cash transactions have to use a lot more of the resources, the special rag paper and the ink, as well as labor and transportation. Let's sic the enviroweenies on them to reinstate the 500 and 1,000! It's for the children!