[moheeb]

You should check again. While food prices haven't quadrupled they have doubled...

According to the IMF Commodity Price Index, at least. http://www.imf.org/external/np/res/commod/index.aspx

[r00fus]

How much of food commodities prices (and for that matter, gold prices) are the result of pure speculation?

http://triplecrisis.com/food-price-volatility/