From Geoff Riley comes this revision paper on commodity prices.
The first half is great on the microeconomic S and D factors that cause prices to rise. Particularly important is the idea of elasticity
The second half looks at the macroeconomic AD and AS effects on the economy as a whole
The whole article has many hyperlinks for you to follow up areas of particular interest
http://www.tutor2u.net/blog/files/Revision_Commodity_Prices.pdf
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