Buoyed by strong returns for shares of Walgreens Boots and Apple Inc., the Dow Jones Industrial Average is trading up Wednesday morning. Shares of Walgreens Boots WBA, +6.85% and Apple Inc. AAPL, +2.74% have contributed to the index’s intraday rally, as the Dow DJIA, -0.08% is trading 83 points (0.3%) higher. Walgreens Boots’s shares are up $2.61 (4.9%) while those of Apple Inc. have risen $2.39, or 2.0%, combining for an approximately 33-point bump for the Dow. Also contributing significantly to the gain are Boeing BA, +1.16%, Caterpillar CAT, -1.72%, and Salesforce.com Inc. CRM, +1.48%. A $1 move in any of the benchmark’s 30 components equates to a 6.58-point swing.