USDA surprised the markets today with significant changes to its U.S. commodity balance sheets. After the initial surprise, however, market settled down and closed with relatively small gains/losses. Of the agency’s changes to the U.S. supply/demand outlook, the most notable is the reduction of 2017/18 corn ending stocks forecasts due to higher exports. Conversely, reductions in soybean exports outweighed lower planted area expectations and left additional supplies in 2017/18 ending stocks for that commodity. USDA projections for the wheat market included few changes, except a bearish addition to ending stocks.   Outside markets are struggling this afternoon with the Dow down another 600 points as of this writing and the S&...