Q. We learn in Bava Basra (84b) that if a buyer makes a proper kinyan on his purchase and a decision has been reached on the price per unit, the sale is valid, even if no calculation has been done to ascertain how many units are contained in the purchase. That is, the total cost of the sale is still not necessarily clear.

In today’s world where a sale may be subject to surcharges and taxes, is a decision regarding unit price sufficient, considering that a buyer might prefer a cheaper deal?

A. Horav Shlomo Miller’s Shlit’a opinion is that taxes are standard and surcharges that are to be normally expected should not make a difference if they were not mentioned, the kinyan therefore stands.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a