Building Runways for Planes That May Not Return

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Dear fellow investors,

During and after World War II, Allied forces established airbases across remote Pacific Islands, bringing with them food, medicine, tools, and machinery that the indigenous people had never encountered before. When the war ended and the bases closed, the cargo stopped coming. But some Islanders, having observed the relationship between certain rituals performed by the soldiers and the subsequent appearance of planes, concluded that all they needed to do was mimic those rituals, with the end result being the planes and their cargo returned.

So, they built wooden control towers, fashioned headsets from coconut shells, lit torches along jungle clearings, and marched in formation with bamboo rifles, replicating each element of the process that had previously brought supplies to the island. To their surprise, the planes never came.1

Richard Feynman used this metaphor to describe pseudoscience, the appearance of rigor without its substance. The cargo cult scientist replicates every observable form of the scientific process while missing the one thing that makes it work. Cargo cult thinking is the precise and sincere replication of the forms of a process whose underlying mechanism no longer operates. We believe it is the most accurate description of how a generation of investors has come to approach investing in today’s financial markets.

Read more: Tax-Aware Investing for Institutional Portfolios

For fifteen years, a clearly validated relationship has existed between market stress and policy intervention. Each time markets faltered, the Federal Reserve cut rates, launched quantitative easing, or provided emergency liquidity, and markets recovered. Investors observed this relationship, internalized it, and have been replicating it with increasing faith: buy every dip, because the mechanism that produced recoveries is permanent and reliable.

What the fidelity to ritual has obscured is how radically the object of the ritual has changed. As passive investment has grown to nearly half the market, buying the dip is no longer an act of broad-based conviction in the American economy; it is a concentrated bet on seven companies that now represent 35–40% of the entire S&P 500 Index.

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