i68.
The first to use “intermediate” in this sense were Nancy and Richard Ruggles: “a considerable portion of the expenditures of households could be considered to be intermediate . . . regrettable necessities”, Nancy D. Ruggles and Richard Ruggles (1970), The Design of Economic Accounts, National Bureau of Economic Research. See also Wilfred Beckerman (1968), An Introduction to National Income Analysis, which references Ruggles and Ruggles’ earlier work.