Trade: What it is

If I have traded my fish for your corn, the following five things must be true:

a) I intended that you get the rights to my fish, on condition that I get the rights to your corn.

b) You intended that I get the rights to your corn, on condition that you get the rights to my fish.

c) I consent to your conditions in (b), and you know it.

d) You consent to my conditions in (a), and I know it.

e) Because of a-d, we achieve our intentions in (in a and b).