Where Did the Dollar Come From ?

Two friends have a nice meal together, and the bill is $25 The friends pay $15 each, which the Waiter gives to the Cashier The Cashier hands back $5 to the Waiter The Waiter keeps $3 as a tip and hands back $1 each So, the friends paid $14 each for the meal, for a total of $28. The Waiter has $3, and that makes $31. Where did the other dollar come from?