The economy’s deep troubles are pushing a growing number of already struggling consumers into bankruptcy, often with far more debt than those who filed in previous downturns. Plummeting home values, dwindling incomes and the near disappearance of credit have proved a potent mixture. While all the usual reasons that distressed borrowers seek bankruptcy — job loss, medical bills, divorce — play significant roles, new economic forces are changing the calculus of who can ride out the tough times and who cannot.

The number of personal bankruptcy filings jumped nearly 8 percent in October from September, after marching steadily upward for the last two years, said Mike Bickford, president of Automated Access to Court Electronic Records, a bankruptcy data and management company.

Filings totaled 108,595, surpassing 100,000 for the first time since a law that made it more difficult — and often twice as expensive — to file for bankruptcy took effect in 2005. That translated to an average of 4,936 bankruptcies filed each business day last month, up nearly 34 percent from October 2007.

Robert M. Lawless, a professor at the University of Illinois College of Law, pointed to the tightening of credit by banks as a significant factor in the increase in October. As banks have pulled back on lending, he said, consumers have been finding it more difficult, and in many cases impossible, to use credit cards, refinance their home mortgages or fall back on their home equity lines to get them through a rough period.

“A credit crunch can drive people into bankruptcy today rather than later as sources of lending dry up,” Professor Lawless said. “With the consumer credit tightening and the economy in a nosedive, this pop could just be the beginning of a long-term rise in the bankruptcy filing rate to levels that are even higher than we had before the 2005 bankruptcy law.” Not only are filings up, but recent filers have had much more credit card debt, often run up in an attempt to keep current on a mortgage that now exceeds the value of their home, bankruptcy lawyers said in interviews.

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