For the second day in a row, Salesforce.com shares are down around $66, after well-known Citigroup analyst Brent Thill cut his rating to Hold from Buy. Thill wrote yesterday, "There could potentially be more weight to downside given cautious macro environment and poor investor sentiment." Translation: The stock will go down because investors think it will go down. That's the best explanation I've heard for how the market works lately. (Chart by Quote.com)