Reference for Bava Metzia 148:8

וכי תימא הכי נמי והתניא מכל מקום כך הלכה אבל אמרו חכמים מי שפרע כו'

— He replied: You must assume that R. Simeon ruled [that the purchaser is morally in possession after paying money] only if the price remained uniform; but did he rule thus when there were two prices?<span class="x" onmousemove="('comment',' I.e., if the price fell. ');">⁸</span>

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