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What is the difference between a Preliminary Regulatory Economic Analysis (PREA) and a Final Regulatory Economic Analysis (REA)?

Lapse in Appropriations

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A PREA accompanies a proposed rule, while a REA accompanies a final rule. (Note that, for convenience, we usually omit the "Final" in "Final Regulatory Economic Analysis." Hence, the acronym is "REA" rather than "FREA.")