There has always been a very good appendix in Lipsey's "Positive
Economics" containing the mathematical proof - only for the very keen
(which I remember once being). I cannot imagine too many pupils
taking an interest in it in these exam-oriented-obsessed days.
Why the mass defections from the list?
Which of the identical twins will be leaving? Can either of them be
prevailed upon to remain?
Cheers,
Frank
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