the dow jones industrial average is trading down monday morning with shares of visa and merck seeing the biggest declines for the index the dow djia was most recently trading 86 points 03 lower as shares of visa v and merck mrk have contributed to the indexs intraday decline visas shares have declined 486 or 23 while those of merck have declined 146 17 combining for a roughly 42point drag on the dow american express axp  amgen inc amgn  and boeing ba are also contributing significantly to the decline a 1 move in any one of the 30 components of the benchmark equates to a 659point swing editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use