There is no doubt that China's move is bearish for commodities. Putting the devaluation in context, however, China has essentially pegged its currency to the U.S. dollar for years with a creeping exchange rate that has appreciated since 2010.China's devaluation of the yuan, which was reported earlier this week, will ultimately have an impact on all commodity prices (not only agricultural) due to its sheer population size and the volume of purchases it makes in the global market. One particular commodity affected will be soybeans as China is the world's largest purchaser. As noted, Chinese exports have faced a steep decline, and part of the rationale behind the devaluation is to make them more competitive on the global market.Over the past y...