Top US lawmakers said Thursday that Congress would take action if accounting regulators and rulemakers failed to quickly improve the mark-to-market accounting standard that has forced banks to record billions of dollars in asset writedowns. "If the regulators and standard setters do not act now to improve the standards, then the Congress will have no other option than to act itself," Paul Kanjorski, the chairman of the US House capital markets subcommittee, told a hearing he called to examine the accounting standard. The Financial Accounting Standards Board is working on new guidance to help banks determine whether a market is...