MENTAL MODEL · M3019

Okun's Leaky Bucket

DecideHigh supportDecision Science

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Updated 2026-08-04

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INTRODUCTION

English translation pending.

CORE DEFINITION

Proposed by Arthur Okun in his book Equality and Efficiency: The Big Tradeoff, the leaky bucket is a metaphor for income redistribution. Money taken from the wealthy and delivered to the poor must travel through taxation and transfer systems, and along the way some of it is lost to administrative cost, reduced work effort, altered saving and investment, and avoidance. Okun's point is not that redistribution is wrong but that it carries a price, so the policy question becomes how much efficiency one is willing to trade for a given gain in equality, and which delivery mechanism leaks least.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Tradeoff framing: Ask how much efficiency a given gain in fairness is worth. - Leak accounting: Add distortion and administrative cost to any redistribution estimate. - Mechanism choice: Compare delivery tools by how much value they lose in transit.

anchor

Anchor fast decisions

The leak has two sources. Administration consumes real resources, since agencies, compliance and paperwork cost money that never reaches a recipient. The larger source is incentive change: higher marginal tax rates reduce the reward for additional work, saving and investment, so some output that would otherwise have existed never gets produced. The bucket therefore delivers less than was poured in, and the size of the leak depends on how the transfer is designed. The metaphor turns an abstract equity debate into a measurable question about delivery loss.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

Estimate the gross transfer before evaluating the policy. 2. Add administrative cost and behavioural distortion to get the net amount delivered. 3. Compare the net gain in equality against the efficiency cost. 4. Compare alternative delivery mechanisms by how much value each one leaks. 5. Revise the estimate as evidence on behavioural response accumulates.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

link
imf.orghttps://www.imf.org/external/pubs/ft/fandd/2011/09/Berg.htmZH · Explicit
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