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Specific risk : ウィキペディア英語版 | Specific risk
In finance, a specific risk is a risk that affects a very small number of assets. This is sometimes referred to as "unsystematic risk". In a balanced portfolio of assets there'd be a spread between general market risk and risks specific to individual components of that portfolio. Determination of the extent of exposure to individual risks is made using models such as Treynor-Black in which the optimal share of a security is inversely proportional to the square of its specific risk. An example would be news that is specific to either one stock or a group of companies, such as the loss of a patent or a major natural disaster affecting the company's operation. Unlike systematic risk or market risk, specific risk can be diversified away.In fact, most unsystematic risk is removed by holding a portfolio of about twenty-five to thirty securities.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Specific risk」の詳細全文を読む
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