Commentary for Avodah Zarah 129:13
אמר אביי נהי דלגין דינא הוא לאותובי מיהא אי לא מותיב ליה מי אמרינן ליה נכי ליה אגרא דלגינתו
Abaye said: Granted that it is lawful to rest a jar upon the animal; nevertheless should [the hirer] not rest a jar upon it, do we say to him, “Deduct the cost of carrying the jar”!
Daf Shevui to Avodah Zarah
Abaye explains that the hirer is not really paying to carry the jar. He has a right to carry the jar, but if he doesn’t bring a jar of wine he will not get a discount. This is the way transportation often works still today. A person has a right to take a suitcase on a plane (sometimes) but she will not receive a discount if she does not bring one.
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