NEW YORK (AP) — Wal-Mart Stores Inc. reported a 9 percent increase in net income for the third quarter, but revenue for the world's largest retailer fell below Wall Street forecasts as its low-income shoppers continue to grapple with an uncertain economy.

The discounter issued a fourth-quarter profit outlook that fell short of Wall Street expectations, and the company's stock price slid more than 3 percent.

Wal-Mart is considered an economic bellwether because the retailer accounts for nearly 10 percent of nonautomotive retail spending in the U.S. The company's latest results show that many low-income Americans — it's estimated that the typical Wal-Mart customer has an average household income of between $30,000 and $60,000, rents their homes and doesn't own stock — continue to struggle even as the housing and stock markets are improving.

The disappointing revenue comes as Wal-Mart, like other retailers, is preparing for the busy winter holiday shopping season in the U.S. next week. The period, which runs roughly from November throughout December, is a time when stores can make up to 40 percent of their annual revenue. Wal-Mart has said that it plans to offer deeper discounts and a broader assortment of merchandise during this year's season to draw in shoppers.

"Macroeconomic conditions continue to pressure our customers," said Charles Holley, Wal-Mart's chief financial officer. "The holiday season is predicted to be very competitive but we are well prepared to deliver on the value and low prices our customers expect."

The disappointing revenue results come a year after Wal-Mart's U.S. namesake business turned a corner by reemphasizing low prices and restocking stores with thousands of basic items that it had gotten rid of in an overzealous bid to reduce clutter.

During the third quarter of last year, the division reversed nine straight quarters of declines in revenue at stores opened at least a year, which is considered a key measure of a retailer's health. The U.S. namesake business has recorded five consecutive quarters of gains since the division rebounded, including a 1.5 percent increase in the third quarter.

But the third-quarter gain is just shy of the 1.8 percent increase analysts polled by Thomson Reuters were expecting. It's also a slowdown in growth from the 2.2 percent gain the business posted in the second quarter and the 2.6 percent increase it had in the first quarter.

Analysts say that Wal-Mart's previous results had benefited from the increase in prices shoppers were paying for groceries due to inflation for some items, a trend that is now subsiding. They also say that Wal-Mart is facing tougher revenue comparisons from a year ago when its business first began to rebound.

Ken Perkins, president of Retail Metrics, a research company, said Wal-Mart's revenue is headed in the right direction. But he cautioned that the company will need to continue to keep prices low in order to compete with rivals that have stepped up discounting.

"Overall, it's a relatively good report," he said. "But it shows that its consumer is still struggling."

In the third quarter, Bentonville, Ark.-based Wal-Mart earned $3.63 billion, or $1.08 per share, in the quarter ended Oct. 31. That compares with $3.33 billion, or 96 cents per share, in the year-ago period.

Net revenue, excluding Sam's Club membership fees, rose 3.4 percent to $113.2 million. Excluding the currency impact, net revenue would have been $114.9 million. Analysts were expecting $1.07 per share on net revenue of $114 billion.

Nearly all areas, including food and clothing, registered gains. However, the company's entertainment category, which includes gaming, suffered a decline, dragged down by price deflation. Part of the weakness is also due to the company's layaway business, which winds up deferring sales to the fourth quarter.

For the entire U.S. business, sales at stores opened at least a year rose 1.7 percent, below the 2.1 percent Wall Street estimate. At Sam's Club, the figure was up 2.7 percent, below the 3.8 percent increase Wall Street expected and the 4.2 percent gain it posted in the second quarter.

The company said its business members at Sam's Clubs are being hurt by the economic downturn, and are switching to less-expensive chicken from beef. To boost sales, Sam's Club is increasing its offering of rotisserie chicken, and has reduced prices in several varieties of apples and beauty products.

"Our business members continue to experience economic pressure and uncertainty," said Rosalind Brewer, president of Sam's Clubs.

For the full year, Wal-Mart now said it expects earnings per share to be between $4.88 per share and $4.93 per share. It originally expected earnings per share of $4.83 to $4.93. For the fourth quarter, it forecasts earnings per share to be $1.53 per share and $1.58 per share. Analysts had expected $1.59 per share.

Separately, in a filing with the U.S. Securities and Exchange Commission, Wal-Mart said Thursday that it was looking into potential violations related to the Foreign Corrupt Practices Act in Brazil, China and India. This comes after Wal-Mart initially began investigating its Mexico operations following report that surfaced in April that the retailer allegedly failed to notify law enforcement when company officials authorized millions of dollars in bribes in Mexico to speed building permits and gain other favors. The company continues to work with government officials in the U.S. and Mexico on that investigation.

On Thursday, Wal-Mart's stock fell $2.61 to close at $68.70. Over the past 52 weeks, Wal-Mart stock has been trading between $56.26 and $77.60.