That's relatively new and not because they are being spent more frequently day to day than a lower denomination. They sit in foreign banks mostly.

> Not exactly. While overall demand for US currency is indeed on the rise, most $100 bills are held abroad. According to the Federal Reserve Bank of Chicago, nearly 80 percent of $100 bills—and more than 60 percent of all US bills—are overseas, up from roughly 30 percent in 1980.