Safety-First Rule

Safety-First Rule: Within the context of post-modern and modern portfolio theory, a safety-first rule involves creating a portfolio based on a minimum level of portfolio returns, which is called the minimum acceptable return. By setting up a minimum acceptable return, investors will mitigate the risk of not achieving their investment objective.
A safety-first rule is a form of margin of safety that can be used when creating a portfolio using post-modern portfolio theory. When maximizing the objective function, the expected return used in the security market line equation in lowered, to reflect this margin of safety. The objective function in this capacity is the Sharpe ratio or the Sortino ratio.

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Safety-First Rule

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Safety-First Rule

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