Two titans of fundamentally weighted indexes are being compared to the funds they created, in the hopes of stirring up a little excitement.

A story in Friday’s Wall Street Journal reports that Robert Arnott, chairman of Research Affiliates LLC and head of Research Affiliates Fundamental Indexes (RAFI), is accusing his rivals of stealing his idea of fundamental weighting, or weighting companies based on cash flow, sales, book value and dividends.

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