System and method regarding controlling a computer system and computing directed to constant dollar instruments. The method can include providing a computer system including a computer connected to an input device and to an output device; operating a computer program, at the computer, that facilitates: receiving, at the input means, input information; determining, from the input information, an infill index; receiving, at the input device, input financial product information; processing, at the computer, the input financial product information with the infill index to produce data corresponding to a constant dollar financial instrument; and outputting the data at the output device.