Commentary for Kiddushin 40:4
אמר רב נחמן בר יצחק תרי קראי כתיבי כתיב (ויקרא כה, נא) אם עוד רבות בשנים וכתיב (ויקרא כה, נב) ואם מעט נשאר בשנים וכי יש שנים מרובות ויש שנים מועטות אלא נתרבה כספו מכסף מקנתו נתמעט כספו כפי שניו
But [the meaning is:] if his value increases, [then his redemption shall be] out of the money that he was bought for; if his value decreases, [the basis of redemption is] according unto his years [yet remaining]. But perhaps the meaning is this: If he served two [years], four remaining, he must repay him for four years 'out of the money that he was bought for'; while if he served four [years], two remaining, he must repay him for two, 'according unto his years'?<span class="x" onmousemove="('comment',' The verse may not refer to a rise or fall in values, but be meant literally, as the E.V.');"><sup>7</sup></span>