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In this guest post, William Morris introduces the idea of explanation-based investing as a fresh alternative to the often-misunderstood term “passive investing.” He argues that what investors really need isn’t to be active or passive, but to understand the reasoning behind their choices. Clear explanations, grounded in evidence, can help people make better decisions and achieve stronger long-term outcomes.

The S&P 500's concentration in the Magnificent Seven has critics worried about indexing risk. But Hendrik Bessembinder's research reveals why index concentration actually strengthens the case for passive investing: just 4% of stocks drive all market returns, and active managers consistently miss these winners. Historical data shows market concentration has been normal for 150 years, from railroads to tech giants.

“Passive investing” may sound like settling for average, but the evidence shows the opposite. By avoiding hype and sticking to a disciplined process, index investors tend to outperform. Yet the label itself puts people off. Charley Ellis and behavioural research reveal how one word is shaping outcomes — and why it’s time to reframe the debate.