For the source text click/tap here: Bava Kamma
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Our daf states if produce is left in the public domain without specification with regard to its ownership, it is assumed that the owner has rendered it ownerless. The owner does not expect to derive benefit from the produce, and therefore when the animal ate it he suffered no loss. Consequently, it is a case where this one derives benefit and that one does not suffer a loss, and it is comparable to the case of the squatter in the courtyard.
In order to prove whether or not one must pay for the benefits he gains in a case of "Zeh Neheneh v'Zeh Lo Chaser,"our Daf brings a proof from a mishna (Bava Metzia 117a): If a house and its upper story, which belonged to two separate people, collapsed, necessitating that the entire structure be rebuilt, and the owner of the upper story told the owner of the lower story of the house to build the lower story again so that he could rebuild the upper story, but the owner of the lower story does not want to do so, the owner of the upper story may build the lower story of the house and live in it until the owner of the lower story will pay him for his expenses, and only then will he be required to vacate the lower story of the house and build the upper story.
We explore Alex Ozar’s essay on Towards a Jewish Theology of Democratic Citizenship.