Bava Batra 71: What's the Difference between a Sale and a Gift?

A new mishnah! More on what's not included - and what happens when the transfer of ownership is not via a sale, but other means, such as a gift. Plus, what if the main property (for example, a field) is sold to one party and the not included items are sold to someone else? Also, what IS the difference between a sale and a gift? The Gemara offers several suggestions, from the stipulations regarding not-included property to the generosity presumed to be the intention of a gift. [Who's Who: Rabbi Yehudah ben Nekosa]