The Five Dumbest Things on Wall Street This Week

1. Night and Day

RadioShack (RSH Quote) is up to its old tricks.

Shares in the Fort Worth, Texas, electronics retailer fell this week after its latest round of lousy numbers. RadioShack said sales in stores open at least a year dropped 9.6% from a year ago in the third quarter, even as cell-phone sales have skyrocketed elsewhere. A $16 million quarterly loss surprised analysts.

But then, surprises are nothing new at RadioShack. The company hired retail veteran Julian Day as its turnaround CEO back in July, despite his seeming lack of electronics-industry experience. Perhaps RadioShack was just desperate to shake the shadow of former CEO Dave Edmondson, who left under a cloud back in February. ...