The Dow Jones Industrial Average is falling Monday afternoon with shares of Merck and Apple Inc. delivering the stiffest headwinds for the blue-chip average. The Dow DJIA, +0.15% was most recently trading 120 points lower (-0.4%), as shares of Merck MRK, -2.93% and Apple Inc. AAPL, +1.35% are contributing to the blue-chip gauge’s intraday decline. Merck’s shares are off $1.87, or 2.0%, while those of Apple Inc. have dropped $2.89, or 1.9%, combining for an approximately 31-point drag on the Dow. Also contributing significantly to the decline are Johnson & Johnson JNJ, -0.57%, Amgen Inc. AMGN, -0.28%, and Verizon Communications Inc. VZ, -2.74%. A $1 move in any one of the 30 components of the Dow results in a 6.59-point swing.