BUSINESS DIGEST
Orange County's Bankruptcy The municipal bond market was roiled after Orange County, Calif., sought bankruptcy. The wealthy county's filing threatens to raise borrowing costs for other local governments. And some Wall Street firms may face losses and lawsuits. [ Page D1. ] Other local governments face problems with risky interest-rate investments. But Orange County's troubles may be on a different scale: its $20 billion investment pool is bigger than most and its investments were far more aggressive. [ D1. ]