In a restaurant in one of the American states, the restaurant waitress handed the lunch menu to a man and his wife, and before they looked at the menu, they asked her to offer them the two cheapest dishes because they did not have enough money after not receiving their salary for several months. Due to financial challenges faced by the entity they work for.

The waitress, Sarah, didn't think long. I suggested two dishes to them and they agreed without hesitation as long as they were the cheapest. She brought the two orders and they ate them greedily, and before they left they asked the waitress for the bill. She returned to them with a piece of paper inside her billing wallet on which she wrote what it meant: “I paid your bill from my personal account out of consideration for your circumstances. This is the sum of one hundred dollars as a gift from me, and this is the least I can do for you. Thank you for your kindness. Signed by Sarah.”

The couple was very happy as they left the restaurant.
What is s…