Today's daf is sponsored by Jeffrey and Jill Shames in loving memory of Jill's Mom, Seena Baker, שפרה בת סול וברכה who passed away 9 years ago. "Mom, we pray that wherever you are you experience the reflection of your wisdom and love in your children, your children's children and your children's children's children." Is the time allotted for getting your money back in a case of over/undercharging the same for the buyer and the seller?  Do the laws of exploitation apply only to businesses and not to individuals? Does it depend on what they are selling?  Are there certain merchants to whom laws of exploitation do not apply or are there certain laws of exploitation that do not apply to any merchants? The answer to these questions depends upon how one understands Rabbi Yehuda's opinion in the Mishna. If one sells an item upon condition that the buyer will not bring a claim of exploitation, is that a valid condition? Rav and Shmuel disagree. Do their approaches perfectly align with the debate between Rabbi Meir and Rabbi Yehuda in a case where one betroths a woman and conditions it upon not giving her the financial rights that a wife has in a marriage?  Does it depend on whether the buyer agrees with or without knowing that he/she was overcharged?