The renminbi fell below 7 to the U.S. dollar this past Friday, and that raises the risk of at least two possible developments: 1) the exodus of money out of China; and 2) a declaration by Washington that Beijing is a currency manipulator. The situation adds one more variable to an already tense and precarious situation. A weaker yuan will make China more competitive against Trump’s tariffs, but both capitals know where this is all headed and are making moves to diversify their trading partnerships. China is importing agricultural commodities from other countries, including now Russia, and U.S. agriculture groups have received millions of dollars under the Agricultural Trade Promotion program to look for new markets. U.S. poultry exp...