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Best Buy is taking its best shot at stealing some online market share from Amazon.com with a completely new service meant to challenge the world's largest e-commerce company. Best Buy Marketplace will substantially increase the number of products available at the Best Buy website.

A confidential memo obtained by Bloomberg reveals some big concerns at Walmart -- its U.S. sales, particularly at stores open at least a year, are in big trouble. It's the latest in a long list of bad news for the domestic chain and will certainly put more pressure on CEO Mike Duke.

Like any number of retailers before it, Walmart has decided to experiment with the home delivery of groceries. The "Walmart To Go" service, which is being tested in San Jose, Calif., offers goods similar to those available from other Internet-based home-delivery services like Fresh Direct.

Home retailers Bed Bath & Beyond and Pier 1 Imports are scheduled to post quarterly earnings this week, along with Monsanto, the biotech, agriculture and chemical giant. Here's what analysts expect to see.

Supermarket chains like Kroger and Safeway have posted a string of strong quarterly earnings. But with the costs of gas and agricultural products spiking, that could all change.

It was a rough (even if short) week on Wall Street. But at least the Dow ended higher after losing more than 300 points in the previous three days. Some month-end bargain-hunting also helped stem the slide. [Video]

The Dow suffered a steep triple-digit loss Tuesday as turmoil in Libya ignited a global sell-off in stocks. Oil prices rose sharply, as did safe-haven assets such as Treasurys and the dollar. Disappointing news from Walmart didn't help matters.

Deadly clashes in Libya sent shockwaves through various markets yesterday, setting the stage for more turbulence in the sessions ahead. Gold and oil have already spiked higher on world markets, and U.S. investors will also see some major earnings and economic reports.

Many of America's best-known retailers, including Walmart, Home Depot and JCPenney, will be stepping into the earnings spotlight this week. Their reports come on the heels of disappointing January retail sales numbers from the Commerce Department.

Warren Buffett's Berkshire Hathaway liquidated its positions in a number of high-profile companies during the fourth quarter, but the Oracle of Omaha has hung on to his huge stake in Coca-Cola. And Coke's nearly 4% drop is a weight on Buffett's portfolio.