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: Studying the past allows you to set realistic expectations and avoid the trap of thinking "this time is different". 3. Investment Psychology: You Are Your Own Worst Enemy EP 124: The Four Pillars of Investing ft. William Bernstein

: Understanding past manias helps you stay calm during future downturns. History shows that major declines are a normal part of the investing journey and usually reverse over the long term.

The second pillar is a deep dive into market history . About once every generation, the markets "go barking mad" with bubbles or crashes.

By mastering these "pillars," you can design a low-cost, diversified portfolio that often outperforms professionally managed accounts. 1. Investment Theory: Risk and Reward are Twins

: Bernstein emphasizes that markets are generally efficient , meaning you shouldn’t expect high returns without taking on risk.