Trigger words: deserve (2)
Indicator sentences: I'm not sure what you mean by people deserving tips.
Negotiation parts: You don't have to tip your waiter if you don't want to and you can tip your cashier at the grocery store if you want to do that. In some industries tipping is used as an incentive to provide good service, like in restaurants. Maybe the server makes sure your drinks are always full, food gets to to as quickly as possible, is cooked correctly, etc. because they know that going above and beyond could result in a better tip. If the server is being paid the same amount regardless of the quality of service they provide, why should they bother making sure you're as content with the service as possible? Instead of keeping your drinks full, maybe they fill them once when you sit down and don't bother to come back. Maybe when the burger you wanted well done is only cooked medium well gets dropped off the server doesn't bother to come back a couple minutes later to make sure it was cooked right. Or, maybe the server still does all these things, but you now have to pay more for your food because the restaurant pays its staff more.