The prudent-man rule is a fiduciary investment standard based on care, caution, judgment, and preservation of beneficiary interests.
The Prudent-Man Rule is a standard adopted by some U.S. states to guide fiduciaries—such as executors of wills, trustees, bank trust departments, and administrators of estates—in their investment responsibilities. It imposes a duty to act as a prudent person would in similar circumstances, exercising both caution and discernment to seek reasonable income, preserve capital, and minimize speculative risks.
In practice, fiduciaries must adhere to this standard when managing another’s assets:
Fiduciaries must strive to generate reasonable income while ensuring the principal’s safety. This involves:
The central aim is to avoid undue risk and preserve the entrusted capital. This entails:
Unlike the prudent-man rule that emphasizes individual investment safety, MPT focuses on optimizing the overall portfolio’s risk-return tradeoff.
An evolution of the prudent-man rule, the Prudent Investor Rule incorporates modern investment theory, extending tolerance for particular risks if the overall portfolio adheres to prudent standards.
When reviewing Prudent-Man Rule, ask who has the obligation, what activity triggers it, what evidence must be retained, and what consequence follows. If it affects disclosure, suitability, filing, conduct, capital, supervision, or enforcement exposure, translate the term into a control or procedure.