Opportunity Cost
http://www.youtube.com/watch?v=ezOdQUzLVAo&feature=related
PPF
http://www.youtube.com/watch?v=a5rxIY46J7s&feature=related
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This Blog is aimed at both AS and A2 students. I will identify more challenging A2 material, but reading around the subject sorts the serious student from the dabbler!
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