Cash itself isn't cost-free for businesses. There's the extra time it takes to count change for customers, the mistakes cashiers make when counting change, ther

Cash itself isn't cost-free for businesses. There's the extra time it takes to count change for customers, the mistakes cashiers make when counting change, there's the time it takes to count the register at the end of a shift, the cost of a safe to hold cash on-site, the risk of counterfeit bills (when I cashiered we'd check $50s and $100s but not $20s and lower since it would take too long), and the cost of transporting the cash to the bank (either in the cost of an armored car or the risk of getting robbed on the way to the bank (which happened at another location while I was cashiering, after that they switched to an armored car)).