If there is a water channel on one side of the field and a river on the other side, the field is divided diagonally [bekarna zol] between the two brothers, so that they each receive land adjoining both the river and the water channel. חַד גִּיסָא נִגְרָא וְחַד גִּיסָא נַהֲרָא פָּלְגִין לַהּ בְּקַרְנָא זוֹל:
§ The mishna teaches that a hall, a drawing room, and the like should not be divided unless the two parties will be able to use their respective portions in the same manner that they had previously used them. The Gemara asks: What is the halakha if there is not enough for this one and that one? What is to be done if one of the parties wishes to dissolve the partnership? Rav Yehuda said: There is a halakha of: Either you set a price or I will set a price. That is to say, one party can say to the other: Set a price you are willing to pay for my share, and I will sell my share to you or purchase your share from you at that price. Rav Naḥman said: There is no halakha of: Either you set a price or I will set a price; rather, the partnership continues. וְלֹא אֶת הַטְּרַקְלִין כּוּ׳ אֵין בָּהֶן כְּדַי לָזֶה וּכְדֵי לָזֶה מַהוּ רַב יְהוּדָה אָמַר אִית דִּינָא דְּגוּד אוֹ אֶגּוּד רַב נַחְמָן אָמַר לֵית דִּינָא דְּגוּד אוֹ אֶגּוּד
Rava said to Rav Naḥman: According to you who say that there is no halakha of: Either you set a price or I will set a price, what should they do if there was a firstborn son and an ordinary brother whose father left them a slave and a non-kosher animal as an inheritance? How are they to be divided? Rav Naḥman said to him: I say that they work for this one, the ordinary brother, one day, and for the other one, the firstborn, two days. אֲמַר לֵיהּ רָבָא לְרַב נַחְמָן לְדִידָךְ דְּאָמְרַתְּ לֵית דִּינָא דְּגוּד אוֹ אֶגּוּד בְּכוֹר וּפָשׁוּט שֶׁהִנִּיחַ לָהֶן אֲבִיהֶן עֶבֶד וּבְהֵמָה טְמֵאָה כֵּיצַד עוֹשִׂין אֲמַר לֵיהּ שֶׁאֲנִי אוֹמֵר עוֹבֵד לָזֶה יוֹם אֶחָד וְלָזֶה שְׁנֵי יָמִים
The Gemara raises an objection to Rav Yehuda’s approach from what is taught in a mishna (Gittin 41a): One who is half-slave half-freeman, e.g., a slave who had been jointly owned by two people, one of whom emancipated him, serves his master one day and himself one day; this is the statement of Beit Hillel. Beit Shammai say: You have remedied the situation of his master, who benefits fully from all his rights to the slave, but you have not remedied his own situation. He cannot marry a maidservant, since half of him is free, and a free Jew may not marry a Canaanite maidservant. He is also not able to marry a free woman, since half of him is a slave, and a Jewish woman may not marry a Canaanite slave. And if you say he should be idle and not marry, but is it not true that the world was created only for procreation, as it is stated: “He did not create it to be a waste; He formed it to be inhabited” (Isaiah 45:18)? מֵיתִיבִי מִי שֶׁחֶצְיוֹ עֶבֶד וְחֶצְיוֹ בֶּן חוֹרִין עוֹבֵד אֶת רַבּוֹ יוֹם אֶחָד וְאֶת עַצְמוֹ יוֹם אֶחָד דִּבְרֵי בֵּית הִלֵּל בֵּית שַׁמַּאי אוֹמְרִים תִּקַּנְתֶּם אֶת רַבּוֹ אֶת עַצְמוֹ לֹא תִּקַּנְתֶּם לִישָּׂא שִׁפְחָה אֵינוֹ יָכוֹל לִישָּׂא בַּת חוֹרִין אֵינוֹ יָכוֹל יִבָּטֵל וַהֲלֹא לֹא נִבְרָא הָעוֹלָם אֶלָּא לִפְרִיָּה וּרְבִיָּה שֶׁנֶּאֱמַר לֹא תֹהוּ בְרָאָהּ לָשֶׁבֶת יְצָרָהּ
Rather, the court forces his master to make him a freeman by emancipating the half that he owns, and the court writes a bill in which the slave accepts responsibility to pay half his value to his master. This was the original version of the mishna. The ultimate version of the mishna records the retraction of Beit Hillel: And Beit Hillel retracted its opinion and ruled in accordance with the statement of Beit Shammai. This indicates that it is only in this case, where there is the particular consideration of procreation, that the court compels one of the parties to forfeit his portion and dissolve the partnership. But in other cases there is no halakha of: Either you set a price or I will set a price. אֶלָּא כּוֹפִין אֶת רַבּוֹ וְעוֹשִׂין אוֹתוֹ בֶּן חוֹרִין וְכוֹתְבִין שְׁטָר עַל חֲצִי דָּמָיו וְחָזְרוּ בֵּית הִלֵּל לְהוֹרוֹת כְּדִבְרֵי בֵּית שַׁמַּאי

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The Gemara answers: It is different here, because the slave can say: I will set a price, but he is not able to say: You set a price. In other words, the slave cannot offer to sell himself, because his Jewish side precludes him from selling himself as a Canaanite slave. Therefore, the court would not be able force the master to sell his share, were it not for the consideration of procreation. By contrast, in a situation where either side can buy or sell, one partner can compel the other to either buy his portion or sell his portion to him. שָׁאנֵי הָכָא דְּאֶגּוּד אִיכָּא גּוּד לֵיכָּא
The Gemara suggests: Come and hear a proof from what is taught in a mishna (172a): In a case where there are two brothers, one poor and one rich, and their father left them a bathhouse or an olive press as an inheritance, if the father had built these facilities for profit, i.e., to charge others for using them, the profit that accrues after the father’s death is shared equally by the two brothers. If the father had built them for himself and for the members of his household to use, the poor brother, who has little use for these amenities, cannot force the rich brother to convert the facilities to commercial use; rather, the rich brother can say to the poor brother: תָּא שְׁמַע שְׁנֵי אַחִין אֶחָד עָנִי וְאֶחָד עָשִׁיר וְהִנִּיחַ לָהֶן אֲבִיהֶן מֶרְחָץ וּבֵית הַבַּד עֲשָׂאָן לְשָׂכָר הַשָּׂכָר לָאֶמְצַע עֲשָׂאָן לְעַצְמוֹ הֲרֵי עָשִׁיר אוֹמֵר לֶעָנִי