The standard of prudence to be used by investment officials shall be the "prudent person" standard, and this standard shall be applied in the context of managing an overall portfolio. Investments shall be made with judgment and care, under circumstances then prevailing, which persons of prudence, discretion, and intelligence exercise in the management of their own affairs, not for speculation, but for investment, considering the probable safety of their capital, as well as the probable income to be derived. (Ord. 1999-14 § 1 (part), 1999)