The American economy lost 159,000 jobs in September, the worst month of retrenchment in five years, the government reported, amplifying fears that an already painful downturn had entered a more severe stage that could persist well into next year. Employment has diminished for nine consecutive months, eliminating 760,000 jobs, according to the Labor Department's report. And that does not count the traumatic events of recent weeks, as a string of Wall Street institutions collapsed, prompting the $700 billion emergency rescue package approved by Congress on Friday. "It's a dismal report, and the worst thing about it is that it does not reflect the recent seizure that we've seen in the credit markets," said Michael T. Darda, chief economist at MKM Partners, a research and trading firm in Greenwich, Conn. "There's really nothing good about this report at all. We've lost jobs in nearly every area of the economy, and this is going to get worse before it gets better because the credit markets have deteriorated basically on a daily basis for the last few weeks."