The Dow Jones Industrial Average is rallying Friday afternoon with shares of Merck and Walt Disney leading the way for the price-weighted average. Shares of Merck MRK, +8.37% and Walt Disney DIS, +4.04% have contributed about 25% of the blue-chip gauge’s intraday rally, as the Dow DJIA, +1.43% is trading 580 points (1.7%) higher. Merck’s shares have gained $6.62 (8.8%) while those of Walt Disney have gained $7.45 (4.4%), combining for an approximately 93-point boost for the Dow. Also contributing significantly to the gain are American Express AXP, +3.83%, Visa V, +3.46%, and IBM IBM, +3.16%. A $1 move in any of the index’s 30 components results in a 6.58-point swing.