Although we don't believe in timing the market or panicking over daily movements, we do like to keep an eye on market changes -- just in case they're material to our investing thesis.

U.S. stocks opened higher this morning, with the S&P 500 (SNPINDEX:^GSPC) and the narrower, price-weighted Dow Jones Industrial Average (DJINDICES:^DJI) up 0.53% and 0.2%, respectively, as of 10 a.m. EDT.

Retail: The final chapter
Last Friday, I called general-merchandise retailers' poor quarterly results the most important trend of last week for what it revealed about consumer spending. Yesterday's earnings report from the nation's No. 2 retailer, Target, did nothing to alleviate that concern.

This morning, Sears Holdings (NASDAQ:SHLD) reported its fiscal second-quarter results, and the news was no better. The company posted a loss of $1.70 per share (ex-items) versus Wall Street's expectations of a $1.10 loss. Sales, which fell 6.3% year on year to $8.9 billion, fell short of the consensus estimate of $9.5 billion. Same-store sales in the U.S. fell 1.5%, split between declines of 2.1% for Kmart and 0.8% at Sears Domestic.

Let me be clear, however, that these numbers reflect more than weak consumer demand. For example, Sears stores posted weak sales in appliances, a category in which major competitors Home Depot and Lowe's put up good numbers over the same period. Sears Holdings is controlled by hedge fund manager Edward Lampert, who now runs the company, too, after previous CEO Louis d'Ambrosio left earlier this year due to a family medical problem.

Between Bill Ackman at J.C. Penney (NYSE:JCP) and Eddie Lampert at Sears, the recent record of hedge fund managers trying to revive once-prominent retailers serves as a cautionary tale. Lampert may have modeled his investing style on that of Berkshire Hathaway CEO Warren Buffett, but you won't catch Mr. Buffett trying to run the Nebraska Furniture Mart (one of Berkshire's businesses).

And speaking of J.C. Penney, its Ackman experience was so traumatic that, only this morning, the company announced it had adopted a one-year "poison pill" that prevents any single investor from owning more than 10% of its shares. No excuses for Penney, then -- they will no longer be able to say, "And we would have succeeded if it wasn't for those meddling hedgies!"

Fool contributor Alex Dumortier, CFA has no position in any stocks mentioned; you can follow him on LinkedIn. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.