Hey guysOne of you asked ¡­

Hey guys

One of you asked a question today which made me think that I should add an exercise which hopefully will help clarify what was puzzling that student. So I've added a new Q22 (as usual, this implies that all previous Qt are now Qt+1 for t greater or equal to 22).

In addition, there was a typo in Q19 which I corrected.

Finally I had forgotten to mention the Edgeworth box in the notes, so I did that now, at the top of page 21.