Computer machine, manufacture, methods of making and using the same, and product produced thereby, each pertaining to valuing, trading, and/or documenting securities that produce mostly tax-exempt income. A method includes making a second financial analysis output having a second computed valuation for property, the financial analysis output being made by steps including: controlling a computer in generating as output a valuation for an income-producing security, the security not a tax-exempt security, most of the income produced by the security being tax-exempt; communicating some of the output to a second computer for generating the second valuation; and generating the second financial analysis output, including the second valuation, at the second computer.