Someone with dollar bills to lend will never agree to make a loan with a nominal interest rate of less than zero because:

Having a nominal interest rate less than 0 would mean that a depositor pays a bank to hold its money. If the annual nominal interest rate is negative 1 percent, a deposit of $1000 dollar would come out $10 dollar short the following year which is why someone with dollar bills will never agree to loan with a nominal interest rate that is negative percent.