Agricultural futures traders are aware that futures prices for corn, wheat, soybeans and soy products tend to go down at a much faster rate than they rise. A recent case in point is the first new crop contract month for the 2018 U.S. corn crop, December. Its highest close so far in 2018 was $4.2625 on 23 May. The same contract then finished at $4.0125 yesterday (4 June), a drop of $0.25 or about 6 percent in eight trading days. By historical standards, that may not be a very large price decline during a limited period. However, it is made to seem larger by December corn’s crawling pace of three months to climb from $4.00 to reach its 2018 high close.  The rapid decrease of the December corn price has essentially been triggered b...