Advancements in investment products and trading platforms haven't altered long-standing investing fundamentals, according to neurologist and best-selling financial author William Bernstein. The first pillar of investing according to Bernstein is theory, in which he stressed that risk and return are "joined at the hip." His second pillar is history. Bernstein's final investing pillar is business. This idea is one of the reasons Bernstein feels positive about the exchange-traded funds business and its role in reducing fees.

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Persons: William Bernstein, Bernstein, Bob Pisani, Serena Williams, Covid swoon