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Antti Ilmanen: The Building Blocks of Long-Run Returns (EP.202)

The Rational Reminder Podcast

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Can Long Term Historical Data Be Misleading?

Long run historical averages are our best estimate of expected returns. But if they vary over time, this historicals average is aless useful and then it's often better to study yield based forward looking estimates. So even if these expected returns are constant, the sample average is a noisy estimate. And moreover it's distorted if you've got big valuation changes within the sample.

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