Citigroup Inc. and Goldman Sachs Group Inc., faced with a weakening economy and the prospect of mounting losses, began firing workers as part of the firms' plans to cut more than 12,000 jobs, people with knowledge of the matter said. Goldman, which converted last month from the biggest U.S. securities firm into a commercial bank, yesterday began telling about 3,200 employees, or 10 percent of its workforce, they were out of a job, according to one of the people who declined to be identified because the decisions were confidential. Citigroup has been notifying staff this week who are affected by the bank's plan to discard 9,100 positions over the next 12 months, or about 2.6 percent of its headcount, another person said. http://www.bloomberg.com/apps/news?pid=20601087&sid=a79jjbe.Jymg&refer=home