Stocks slide at the start; caution before earnings By: CNBC.com News July 08, 2014 at 09:30 AM EDT Stocks opened lower on Tuesday, extending the prior day's drop from records, as investors braced for quarterly earnings and considered valuations. Read More >> Related Stocks: Alcoa Family Dollar Stores Fastenal Co Groupon Cl A Infosys Ltd ADR Pricesmart Inc Sentinelone Inc Cl A The Container Store Group Inc W D 40 Company Wells Fargo