Wal-Mart Stores Inc. said yesterday that it was laying off up to 1,200 workers in what it called a normal payroll adjustment and not a response to the weak economy. It appeared likely that Wal- Mart, which has a work force of 367,000, took the step to keep costs in line. Wal-Mart, one of the nation's largest retailers, has built its reputation and success on lower prices, which are dependent on reduced expenses. Don Shinkle, a Wal-Mart spokesman, said from the company's headquarters in Bentonville, Ark., that the cuts were made in the Sam's Clubs warehouse division. About 25 jobs were cut at Sam's headquarters, while the others were spread out among the 192 Sam's outlets, he said. "You look at your payroll and you make various periodic adjustments, depending on the market and other criteria," Mr. Shinkle said. He said Wal- Mart would be adding sales help for the holiday season.