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Tthroughout discoverecon you will notice expand exercises,ineractive graphs, and toutorials. you will also notice 25 new videos hosted by Paul Solman, economics corresponded for the Lehrer newshour for PBS. Solman developed these on video specifically for principles of economics to further illustrate reinforce basic economics concept from the text. these videos are linked to discoverEcon topics to let you view the videos as you work through each discoverEcon chapter