FrameworkCase studyInvestingDecision-makingCareers
A cheap measurable signal beats an expensive intuitive one at scale
Moneyball · 2011
The idea
Moneyball is a story about a baseball team, and the argument underneath it is about information. The scouts were expensive, experienced and confident, and they systematically overvalued what was easy to see. A cheap statistical process found players the market had mispriced because the thing that mattered, getting on base, was unglamorous and hard to observe by eye. The same argument runs through quant investing, where a weak signal applied consistently across thousands of positions beats a strong opinion applied to a few, and through how firms now screen the candidates they hire.
The market misprices what is hard to measure, so a consistent cheap signal can beat an expensive expert.
When it works
Quant interviews, any debate about discretionary against systematic investing, and understanding how you yourself are being assessed in recruiting.
When it may fail
Once everyone measures on-base percentage the edge is gone. A signal that works is small and short-lived, which is the argument of The Man Who Solved the Market.
How to use it
Asked why a systematic strategy can work, say what the scouts got wrong: they priced the visible and ignored the measured. Then name one signal in markets that is cheap to compute, weak on its own and valuable in volume.
Where it came from
Film Moneyball · 2011
What the source says. A statistical process beating a much better funded scouting one, an argument that generalises into quant investing and into how firms screen candidates.
Connected ideas
Takes it further
A signal that works is small, short-lived and expensive to findExpect an edge to be small, to fade, and to cost more to find than to run; a large, durable, obvious one is probably not an edge.
Says something similar
Anchoring and base rate neglect are the two biases that cost moneyBefore estimating, ask what number is anchoring you and what the base rate is for cases like this.
Concepts
Put it to work on L3VLUP
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