By MarketWatch Automation
Shares of Visa and Caterpillar are retreating Wednesday morning, propelling the Dow Jones Industrial Average into a slump. The Dow /zigman2/quotes/210598065/realtime DJIA -0.05% was most recently trading 687 points (2.5%) lower, as shares of Visa /zigman2/quotes/203660239/composite V -1.07% and Caterpillar /zigman2/quotes/203434128/composite CAT +0.12% have contributed to the index's intraday decline. Visa's shares are down $8.24 (4.3%) while those of Caterpillar have declined $6.61 (4.2%), combining for an approximately 98-point drag on the Dow. Also contributing significantly to the decline are Salesforce.com Inc. /zigman2/quotes/200515854/composite CRM -7.91% , Microsoft /zigman2/quotes/207732364/composite MSFT -0.85% , and Apple Inc. /zigman2/quotes/202934861/composite AAPL +0.35% . A $1 move in any one of the 30 components of the Dow results in a 6.58-point swing.