Obligations of any authority, commission or similar governmental organization existing pursuant to the laws of this Commonwealth or the laws of any other state or of the District of Columbia shall be authorized investments if purchased or retained in the exercise of that degree of judgment and care, under circumstances then prevailing, which men of prudence, discretion and intelligence exercise in the management of their own affairs, not in regard to speculation but in regard to the permanent disposition of their funds, considering the probable income to be derived therefrom as well as the probable safety of their capital. The authorization to make and retain investments pursuant to this section shall be in addition to, and independent of, authorizations to make investments pursuant to other provisions of this chapter and requirements applicable under other provisions of this chapter shall not affect investments also authorized by this section.