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Did Reform Of Prudent Trust Investment Laws Change Trust Portfolio Allocation?, Max M. Schanzenbach, Robert H. Sitkoff

Law and Economics Papers

This paper investigates the effect of changes in state prudent trust investment laws on asset allocation in noncommercial trusts. The old prudent man rule favored “safe” investments

such as government bonds and disfavored “speculation” in stock. The new prudent investor rule, now widely adopted, relies on modern portfolio theory, freeing the trustee to invest based on risk and return objectives reasonably suited to the trust and in light of the composition of the trust portfolio as a whole. Using state- and institution-level panel data from 1986-1997, we find that after a state’s adoption of the new prudent investor rule, trust …