And in a much wider group, Big Lots is the big winner in the S&P 500 with a 40.25 percent gain in through Friday. The shares of the company, which specializes in  the sale of excess inventory, posted a 33 percent increase in March alone.

As the U.S. economy struggles, lower-priced retailers like Wal-Mart and Big Lots have benefited from consumers trading down.

Warehouse clubs like Costco and BJ’s have also been helped by customers looking for bargains on food and fuel.

So as the economy worsens, Wal-Mart shareholders gain. Through Friday, Wal-Mart investors are collectively $18.4 billion richer this quarter, the biggest quarterly increase in Wal-Mart’s market cap in four years.

(Additional reporting by Dan Burns)

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