s4h-economics-externalities

Name: s4h-economics-externalities
Author: human-avatar

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How to install s4h-economics-externalities?

human-avatar/skills-for-humanity/s4h-economics-externalities

$npx -y skills add human-avatar/skills-for-humanity --skill s4h-economics-externalities

Installs into the current project.

Summary

Identifies costs and benefits not borne by the decision-maker — and how to internalise them. Triggers: 'externality', 'who else is affected', 'costs falling on others', 'side effects', 'spillover', 'the market isn't accounting for this', 'negative externality', 'positive external

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SKILL.md

1	# Economics: Externalities
2
3	A.C. Pigou's insight, formalised in The Economics of Welfare (1920): when the person making a decision does not bear all of its costs — or capture all of its benefits — they will systematically make the wrong decision. The factory owner who pollutes a river imposes costs on everyone downstream but pays none of them. The individual who gets vaccinated reduces the risk of infection for everyone around them but captures only a fraction of the total benefit. In both cases, the divergence between private cost-benefit calculation and social cost-benefit calculation produces a predictable market failure.
4
5	This is not a moral failure — it is a structural one. The decision-maker is not evil for failing to account for costs they do not bear; they are responding rationally to their situation. Pigouvian analysis makes the structural problem visible: the social optimum and the private optimum diverge whenever externalities exist. And wherever they diverge, there is scope for a policy or institutional intervention that realigns them — tax (for negative externalities), subsidy (for positive externalities), property rights (Coase's alternative), or social norms and regulation.
6
7	Ronald Coase's counter-argument (the Coase Theorem) adds a crucial qualification: when transaction costs are low and property rights are clear, private negotiation between parties can internalise externalities without government intervention — and produce the efficient outcome regardless of who holds the initial property right. In practice, transaction costs are often high, so Coase is a theoretical benchmark rather than a practical solution. But identifying whether transaction costs are low is a crucial diagnostic step.
8
9	---
10
11	## Your Process
12
13	Step 1: Identify the decision and the decision-maker
14	Clarify what decision is being made, who is making it, and what the decision-maker's cost-benefit calculation looks like from their perspective alone. Establish the baseline: what does the decision-maker see as costs and benefits?
15
16	Framing check: Confirm the decision and the scope of effects before continuing. State what you've identified in one sentence, then use `AskUserQuestion`:
17	- Question: "I'm reading this as: [one-sentence framing — the decision being made and the concern that costs or benefits are falling on parties outside the decision]. Is that right?"
18	- Header: "Framing"
19	- Options:
20	- Yes — proceed — framing is correct
21	- Adjust — one element is off; user will correct it before you continue
22	- Reframe — different situation than read; incorporate the correction before proceeding
23
24	Step 2: Map affected third parties
25	Who else is affected by this decision who is not part of the decision-maker's calculation? Cast the net wide: downstream effects, neighbourhood effects, time-lagged effects, effects on non-human stakeholders (environment), effects on future parties. Distinguish between parties who are affected positively (positive externalities — they receive a benefit they did not pay for) and negatively (negative externalities — they bear a cost they did not choose).
26
27	Step 3: Quantify the externalities
28	For each affected party, estimate the magnitude of the external effect. This does not need to be precise — it needs to be directionally correct and clearly communicated. Use: monetary estimates where possible, physical or health measures where monetary conversion is contested, and ordinal rankings (large/medium/small) where quantification is not feasible. Note when external costs are diffuse (spread across many parties) vs. concentrated.
29
30	Step 4: Calculate the wedge
31	The externality wedge is the gap between the private optimum (what the decision-maker will choose) and the social optimum (what would be chosen if all costs and benefits were internalised). Quantify the wedge: how much more or less of the activity will occur under private calculation vs. the social optimum? The size of this wedge determines the scale of the market failure and the urgency of intervention.
32
33	Step 5: Assess internalisation mechanisms
34	For each externality, evaluate the available mechanisms for internalisation:
35	- Pigouvian tax/subsidy: Tax the negative externality; subsidise the positive. The mechanism is efficient if the tax/subsidy equals the marginal external cost/benefit. Practical limitation: measuring the marginal external cost accurately is hard.
36	- Property rights (Coase): If transaction costs are low, assign clear property rights and l

human-avatarPublisher · 61 listings

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human-avatar/skills-for-humanity

# Economics: Externalities

A.C. Pigou's insight, formalised in *The Economics of Welfare* (1920): when the person making a decision does not bear all of its costs — or capture all of its

This is not a moral failure — it is a structural one. The decision-maker is not evil for failing to account for costs they do not bear; they are responding rati

Ronald Coase's counter-argument (the Coase Theorem) adds a crucial qualification: when transaction costs are low and property rights are clear, private negotiat

Repohuman-avatar/skills-for-humanity

LicenseMIT

TypeSkills

CategoryGeneral

UpdatedJul 2026

Repo stars205

First seenJul 22, 2026

People who liked this also viewed

6 picks

Type

s4h-economics-externalities

205stars23forks

View on GitHub

How to install s4h-economics-externalities?

human-avatar/skills-for-humanity/s4h-economics-externalities

$npx -y skills add human-avatar/skills-for-humanity --skill s4h-economics-externalities

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Economics: Externalities
2
3	A.C. Pigou's insight, formalised in The Economics of Welfare (1920): when the person making a decision does not bear all of its costs — or capture all of its benefits — they will systematically make the wrong decision. The factory owner who pollutes a river imposes costs on everyone downstream but pays none of them. The individual who gets vaccinated reduces the risk of infection for everyone around them but captures only a fraction of the total benefit. In both cases, the divergence between private cost-benefit calculation and social cost-benefit calculation produces a predictable market failure.
4
5	This is not a moral failure — it is a structural one. The decision-maker is not evil for failing to account for costs they do not bear; they are responding rationally to their situation. Pigouvian analysis makes the structural problem visible: the social optimum and the private optimum diverge whenever externalities exist. And wherever they diverge, there is scope for a policy or institutional intervention that realigns them — tax (for negative externalities), subsidy (for positive externalities), property rights (Coase's alternative), or social norms and regulation.
6
7	Ronald Coase's counter-argument (the Coase Theorem) adds a crucial qualification: when transaction costs are low and property rights are clear, private negotiation between parties can internalise externalities without government intervention — and produce the efficient outcome regardless of who holds the initial property right. In practice, transaction costs are often high, so Coase is a theoretical benchmark rather than a practical solution. But identifying whether transaction costs are low is a crucial diagnostic step.
8
9	---
10
11	## Your Process
12
13	Step 1: Identify the decision and the decision-maker
14	Clarify what decision is being made, who is making it, and what the decision-maker's cost-benefit calculation looks like from their perspective alone. Establish the baseline: what does the decision-maker see as costs and benefits?
15
16	Framing check: Confirm the decision and the scope of effects before continuing. State what you've identified in one sentence, then use `AskUserQuestion`:
17	- Question: "I'm reading this as: [one-sentence framing — the decision being made and the concern that costs or benefits are falling on parties outside the decision]. Is that right?"
18	- Header: "Framing"
19	- Options:
20	- Yes — proceed — framing is correct
21	- Adjust — one element is off; user will correct it before you continue
22	- Reframe — different situation than read; incorporate the correction before proceeding
23
24	Step 2: Map affected third parties
25	Who else is affected by this decision who is not part of the decision-maker's calculation? Cast the net wide: downstream effects, neighbourhood effects, time-lagged effects, effects on non-human stakeholders (environment), effects on future parties. Distinguish between parties who are affected positively (positive externalities — they receive a benefit they did not pay for) and negatively (negative externalities — they bear a cost they did not choose).
26
27	Step 3: Quantify the externalities
28	For each affected party, estimate the magnitude of the external effect. This does not need to be precise — it needs to be directionally correct and clearly communicated. Use: monetary estimates where possible, physical or health measures where monetary conversion is contested, and ordinal rankings (large/medium/small) where quantification is not feasible. Note when external costs are diffuse (spread across many parties) vs. concentrated.
29
30	Step 4: Calculate the wedge
31	The externality wedge is the gap between the private optimum (what the decision-maker will choose) and the social optimum (what would be chosen if all costs and benefits were internalised). Quantify the wedge: how much more or less of the activity will occur under private calculation vs. the social optimum? The size of this wedge determines the scale of the market failure and the urgency of intervention.
32
33	Step 5: Assess internalisation mechanisms
34	For each externality, evaluate the available mechanisms for internalisation:
35	- Pigouvian tax/subsidy: Tax the negative externality; subsidise the positive. The mechanism is efficient if the tax/subsidy equals the marginal external cost/benefit. Practical limitation: measuring the marginal external cost accurately is hard.
36	- Property rights (Coase): If transaction costs are low, assign clear property rights and l

human-avatarPublisher · 61 listings

Preview

human-avatar/skills-for-humanity

# Economics: Externalities

A.C. Pigou's insight, formalised in *The Economics of Welfare* (1920): when the person making a decision does not bear all of its costs — or capture all of its

This is not a moral failure — it is a structural one. The decision-maker is not evil for failing to account for costs they do not bear; they are responding rati

Ronald Coase's counter-argument (the Coase Theorem) adds a crucial qualification: when transaction costs are low and property rights are clear, private negotiat

Repohuman-avatar/skills-for-humanity

LicenseMIT

TypeSkills

CategoryGeneral

UpdatedJul 2026

Repo stars205

First seenJul 22, 2026

People who liked this also viewed

6 picks

Type