FAS 157 and 159 establish standards for fair value accounting and measurements. FAS 157 defines fair value as the price received to sell an asset or paid to transfer a liability between market participants as of the measurement date. It also provides guidance on valuation techniques, inputs, and required disclosures. FAS 159 allows entities to measure certain financial instruments at fair value on an irrevocable election with changes in fair value recognized in earnings. Both standards require expanded disclosures and considerations for auditors and preparers.