Since the beginning of the nineteenth century, a large number of price index number formulae have been developed …, mostly named after their inventors, such as the Paasche and Layspeyres indexes. Parallel with the invention of new index …’s two classics on index numbers, The Purchasing Power of Money (1911) and The Making of Index Numbers (1922). In these …

' was addressed, at least in part, to the index number problem of estimating intertemporal changes in general purchasing …