http://www.sparknotes.com/economics/macro/aggregatedemand/section2.
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxlY29ub21pY3NzYTEyM3xneDo3MGUxOGEwODdhYzhlYWE2
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxlY29ub21pY3NzYTEyM3xneDo3MGUxOGEwODdhYzhlYWE2
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