You should always tip for carry-out orders.
Zac is coming home from a long day of work and is worn out as well as tired.
Zac wants to find an easy dinner solution.
Zac gets a carry out order and leaves 20% tip.
Zac picks up a to go order from a restaurant without leaving a tip.
The workers are happy to finally get a tip and make more money.
The workers at the restaurant earn less money.