פירוש על קידושין 56:3

The Talmud now alludes to a dispute about whether produce (and animals) can be used to effect barter. R. Sheshet says it can, but R. Nahman says it may not. We should note that this is a new problem, not related to the previous one. How can R. Nahman even understand the mishnah which does seem to say that produce and animals and not just vessels can be used for barter.