We established the original IFA Index Portfolios back in 2000, based on the DFA Matrix book and several peer-reviewed academic papers describing "Modern Portfolio Theory." Those original Index Portfolios have essentially remained the same since 2000. But now we've changed the numbering system, so each new portfolio matches its stock allocation. We have also made a slight improvement in the historical efficiency of the portfolios, based on the last 50 years.
To learn more, read our article. ifa.com/articles/improved_index_portfolios.aspx
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