Changelog:
Last Update: Feb 2, 2016
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Changes 2/2/16
Week 3, First set of Ricardian slides.  Slide 28, had df(x,y)/dx instead of df(x,y)/dy.  
Week 3, Second set of Ricardian slides.  Slides 19-20, had c_2^H instead of c_1^F.  Slide 18 had some problem (corrected on Feb 12).

Changes 1/31/16
Week 2, Constructing Relative Supply Graph slides: Fixed typos on slide 5, where RS was incorrectly defined (had Q1*=0 instead of Q2=0)