Correction about TA session on 5/15

In HW4 problem 4 (ii), my explanation was misleading in the TA session.

Regarding the proof of upper-hemicontinuity, the proof of MWG (p.93) is correct.
However, you can't use just same argument
if you want to prove continuity of demand function.
(In other word, "The same argument also establishes continuity ..."
in MWG p.94 is incorrect.)

Thanks to Kubota for letting me know.

Best regards,

Murooka