Shares of Visa and Salesforce.com Inc. are retreating Monday afternoon, propelling the Dow Jones Industrial Average selloff. Shares of Visa V, -3.05% and Salesforce.com Inc. CRM, -2.78% are contributing to the blue-chip gauge’s intraday decline, as the Dow DJIA, -1.13% was most recently trading 452 points lower (-1.3%). Visa’s shares are off $9.56 (4.2%) while those of Salesforce.com Inc. are down $8.90, or 3.2%, combining for a roughly 122-point drag on the Dow. Other components contributing significantly to the decline include Apple Inc. AAPL, -2.85%, Microsoft MSFT, -2.73%, and Walmart WMT, -1.18%. A $1 move in any one of the 30 components of the index equates to a 6.58-point swing.