U.S. ag exports have benefited from strong global demand and also dovish monetary policy at home. The latter is about to change, though, and could impact the former.MY 2016/17 has seen a major increase in U.S. ag exports with the volumes for almost all commodities rising by double-digit percentages after a few slump years.In terms of value, exports of U.S. ag commodities are likely to reach their third-highest level this year (following 2013 and 2014, respectively).Low commodity prices are one reason for this with the volume more than offsetting per-bushel or per-pound values. However, another is the global economic growth that has been strong among the economies of major trading partners. That has also been a factor in the U.S. dollar fall...