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AUDIT is the inspection of the accounting records and procedures of a business, government unit, or other reporting entity by a trained accountant for the purpose of verifying the accuracy and completeness of the records. It could be conducted by a member of the organization (internal audit) or by an outsider (independent audit). A CPA audit determines the overall validity of financial statements. A tax audit (IRS in the U.S.) determines whether the appropriate tax was paid. An internal audit generally determines whether the company's procedures are followed and whether embezzlement or other illegal activity occurred.
CONVEXITY is the price change that occurs for a bond not accounted for or predicted by modified dU1"ation. Convexity explains why price change estimates using modified duration increase in error as the yield changes, generally by more than 100 basis points. Bonds with positive (negative) convexity have increased (decreased) duration as interest rates fall (rise). Bonds with positive convexity, such as those with put options, have returns higher than those predicted by duration alone. Mortgage-backed securities and callable bonds generally have negative convexity, which means that the price increase predicted by duration for a steep rate decline is too high.
BOOKS OF ACCOUNT are the financial records of a business. Usually refers to the lowest level of recorded data, before summaries are made.
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