A computer-aided method for implementing at least one synthetic investment fund. The method includes providing a digital electrical computer apparatus including a digital computer having a processor, the processor electrically connected to a memory device for storing and retrieving machine-readable signals, to an input device for converting input information into input electrical data, and to an output device for converting output electrical data into print, the processor programmed to control the apparatus to receive the input data and to produce the output data by steps including: forming a synthetic investment fund by entering, as some of the input information, at least one of the group consisting of an amount of an interest-bearing asset, and an amount of a derivative instrument, and entering a specification of a relationship for the amounts; entering, as some of the input information, respective market prices for the interest-bearing asset and for the derivative instrument; calculating a unit value for each said class of interests in the fund in response to the market prices; and generating output for investor reporting, the output including holding data for each said class of interests in the fund and the unit value for each said class of interests in the fund.