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Is there data and proof that a diversified portfolio can generate higher returns than the S&P 500 Index?
Stocks, Bonds, Bills, and Lottery Tickets notes the work of Fama and French who researched the idea of a small-cap premium along with a value premium that may be useful to note in terms of what has outperformed if one looks from 1926 to present. Slice and dice would also be another article about an approach that over weights the small-cap and value sides of things if you want another resource here.