ABA Definition

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ABA (Accredited Business Accountant or Accredited Business Advisor), in the US, is a national credential conferred by Accreditation Council for Accountancy and Taxation to professionals who specialize in supporting the financial needs of individuals and small to medium sized businesses. ABA is the only nationally recognized alternative to the CPA. Most accredited individuals do not perform audits. Generally, they are small business owners themselves. In addition to general accounting work, CPAs are also heavily schooled in performing audits; however, only a small fraction of Americas businesses require an audit. In general, a CPA has majored in accounting, passed the CPA examination and is licensed to perform audits. An ABA has majored in accounting, passed the ABA comprehensive examination and in most states is not licensed to perform audits.

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DERIVATIVE is a transaction or contract whose value depends on or, as the name implies, derives from the value of underlying assets such as stock, bonds, mortgages, market indices, or foreign currencies. One party with exposure to unwanted risk can pass some or all of the risk to a second party. The first party can assume a different risk from a second party, pay the second party to assume the risk, or, as is often the case, create a combination. Derivatives are normally used to control exposure or risk. See DERIVATIVE CONTRACT.

CAPITAL ASSET PRICING MODEL (CAPM) is an equilibrium model which describes the pricing of assets, as well as derivatives. The model concludes that the expected return of an asset (or derivative) equals the riskless return plus a measure of the assets non-diversiable risk ("beta") times the market-wide risk premium (excess expected return of the market portfolio over the riskless return). That is: expected security return = riskless return + beta x (expected market risk premium). It concludes that only the risk which cannot be diversified away by holding a well-diversified portfolio (e.g. the market portfolio) will affect the market price of the asset. This risk is called systematic risk, while risk that can be diversified away is called diversifiable risk (or "nonsystematic risk"). Unfortunately, The CAPM is more difficult to implement in practice than the binomial option pricing model or the Black-Scholes formula because to price an asset it requires measurement of the assets expected return and its beta. But, on the other hand, it also attempts to answer a more difficult question: The binomial option pricing model or the Black-Scholes formula asks what is the value of a derivative relative to the concurrent value of its underlying asset. The CAPM asks what is the value of an asset (or derivative) relative to the return of the market portfolio. Because of this, the option models are often referred to as "relative" valuation models, while the CAPM is considered an "absolute" valuation model. William Sharpe won the Nobel Prize in Economics principally for his role in the development of the CAPM.

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