Walmart Inc. said on Wednesday it was planning to hire about 150,000 new U.S. store workers, most of them permanent and full-time, in preparation for the busy holiday season. The U.S. retailer also said it would offer extra hours to many of its store workers during the period, days after rival Target Corp. also said it would provide more work hours for its retail employees amid a labor shortage in the country. Retailers have been offering pay raises and other incentives to retain staff to ensure they have enough workers during the holiday shopping season, which starts a day after Thanksgiving and continues into early January. Walmart has implemented three wage increases this year, with its U.S. average hourly wage now at $16.40. It also offers other benefits such as no-cost college tuition, similar to many of its rivals. Walmart had previously announced it would hire 20,000 workers in its …