South Dakota Codified Laws
Chapter 05 - Investment And Management Powers Of Fiduciaries
Section 55-5-10 - Investment strategy--Productivity judged by whole portfolio.

55-5-10. Investment strategy--Productivity judged by whole portfolio.
The trustee shall pursue an investment strategy that considers both the reasonable production of income and safety of capital, consistent with the trustee's duty of impartiality and the purpose of the trust. Whether investments are underproductive or overproductive of income shall be judged by the portfolio as a whole and not as to any particular asset.

Source: SL 1995, ch 271, ยง10.