Vanguard founder  Jack Bogle and finance professor Jeremy Siegel took their long-standing debate over the best way to index from the editorial pages to the airwaves of CNBC  last week, MarketWatch  reports.

Siegel, who teaches at the University of Pennsylvania's Wharton School and who is aligned with Wisdom Tree, an exchange-traded fund start-up, argued once again that the best way to build and index is by the strength of company stock.  He calls the resulting ETFs he has constructed, "fundamentally weighted."

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