And you shall spend the money for whatever your soul desires—for oxen or for sheep or for wine or for strong drink or for whatever your soul asks of you—and you shall eat there before Hashem your God and you shall rejoice, you and your household.
English: "For whatever your soul desires" — one may not redeem ma’aser sheni upon a coin that is not current, for it is written "and you shall give the money for whatever your soul desires."
On the daf / in context: A coin that cannot freely purchase whatever one wishes (because of local restrictions) is invalid for redemption.
Type of Learning
Derash on the verse (Maaser Sheni) — the redeeming coin must be freely current.
What Is Learned
Ma’aser sheni may be redeemed only upon a coin that circulates freely and can purchase whatever the soul desires.