Commentary for Bava Metzia 138:13

אמר רב ששת מ"ט שתיק רב לא שמיעא ליה הא דתניא אע"פ. שאמרו אין מקבלין צאן ברזל מישראל אבל מקבלין צאן ברזל מן הנכרים אבל אמרו השם פרה לחבירו ואמר לו הרי פרתך עשויה עלי בשלשים דינר ואני אעלה לך סלע בחדש מותר לפי שלא עשאה דמים

<b><i>GEMARA</i></b>. Our Rabbis taught: One may offer an increased land rental without fear of usury. E.g., If one rents a field from his neighbour for ten <i>kor</i> annually, and proposes, 'Give me two hundred <i>zuz</i> to expend thereon [sc. in improving the land], and I will pay you twelve <i>kor</i> annually,' it is permitted. But an increased rental may not be offered for a shop or a ship.<span class="x" onmousemove="('comment',' In consideration of a loan for stock. In the first case, the money is expended on the field itself and therefore it is the equivalent of renting a better field, and hence worth more, notwithstanding that the 200 zuz must be separately repaid. But here the capital value of the shop and ship is not increased; therefore the money advanced for stock is an ordinary loan, and the higher rental constitutes interest. ');">¹²</span>

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