It's a market than can frustrate -- and humble -- institutional investors and individual investors alike. Moreover, perhaps the most memorable dimension to the bear market that began in October 2007 will be its ability to take down the stocks of companies with demonstrated business models, and Potash Corp. (NYSE: POT) is one. Potash remains one of the preeminent fertilizer companies in the world, producing three critical, primary plant nutrients and phosphate animal feed ingredients, for both developed and developing world markets. It is the largest producer in the world of its namesake, potash, which accounted for 43% of revenue in 2008.

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