Greenspan Put
Updated 2026-08-02
INTRODUCTION
English translation pending.
CORE DEFINITION
The Greenspan put names the belief, prevalent during Alan Greenspan's tenure as Federal Reserve chair, that the central bank would ease policy whenever markets fell sharply. The implicit guarantee functions like a put option: investors keep the upside while the downside is cushioned, which encourages leverage and risk-taking. Commentators credit the expectation with shaping behavior after the 1987 crash and the 1998 Long-Term Capital Management rescue. Key qualifications: the guarantee is never formal, depends on inflation and political constraints, and can be withdrawn when investors most rely on it.
SCAFFOLDING EFFECT
Reduce cognitive load
- Spot implicit guarantees: identify who behaves as if someone else will absorb their losses. - Price the backstop: ask what risk premium would exist without the expectation of rescue. - Design accountability: remove bailout expectations from your own organization before they breed recklessness.
Anchor fast decisions
If investors believe losses will be cushioned, the expected cost of risk falls while the expected reward stays the same, so optimal behavior shifts toward more leverage. That extra leverage raises the damage when a shock arrives, which increases pressure on the guarantor to intervene and confirms the original belief. The loop is self-reinforcing until the guarantor hits a constraint it cannot ignore, such as inflation or political limits.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Greenspan_putverified
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