This little work has been written in the interest of harmony. In mathematics disputes must soon come to an end, when the one side is proved and the other disproved. And where room could be left for long-continued disputation. It is therefore somewhat surprising that one economist after another takes up the subject of index-numbers, potters over it for a while, differs from the rest if he can, and then drops it. And so nearly sixty years have gone by since Jevons first brought mathetnatics to bear upon this question, and still economists are at loggerheads over it. Yet index-numbers involve the use of means and averages, and these being a purely mathematical element, demonstration ought soon to be reached, and then agreement should speedily follow.
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