求翻译：Economic historian Robert Higgs, a fellow with the Independent Institute in California, attributes America's anemic job performance to uncertainty: not knowing what steps the government will take to get its fiscal house in order and what form the hundreds of still-to-be-written rules and regulations implementing various new laws will take. If it survives legal challenges, the new health-care law, for example, will affect virtually every employer in the country. The regulations implementing the law are still a work in progress. Then, of course, there will be a battle over how the regulations are interpreted. It all adds up to great uncertainty.是什么意思？

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