Extra-Welfarism

Extra-Welfarism in Health Economics

Extra-welfarism is a school of normative welfare economics that lets an evaluation count characteristics of people, above all their health, alongside the utility they gain from goods and services. In health economics it is the usual justification for cost-utility analysis, in which a fixed budget buys as much health as possible, with health measured in QALYs and the values behind it drawn from a representative public or set by an accountable decision-maker. The welfarist alternative judges a policy only by individual utility, which in applied work means what people are willing and able to pay. The two schools can rank the same NHS programmes in opposite orders because they disagree about what counts as a benefit and whose values apply.

Origins in Sen, Culyer and the decision-making approach

The word welfarism comes from Amartya Sen, who used it for judging the goodness of states of affairs only by utility information. In an essay first published in 1990, Tony Culyer separated commodities, the characteristics of commodities, the characteristics of people and utility. In health care, he argued, characteristics of the care such as timeliness and efficacy change characteristics of people, such as being reassured or healthier, which matter for human flourishing.

His example compared a "pleasure machine", who turns income into pleasure very efficiently, with a cheerful person disabled by arthritis. A rule based only on utility can move resources to the pleasure machine and away from the person in obvious need, treating the arthritis as irrelevant unless it changes utility. Culyer argued that the QALY approach to cost-effectiveness "need not be welfarist at all", since it can use information about people's health directly.

Brouwer, Culyer, van Exel and Rutten (2008) trace further roots, among them merit goods and the 1944 white paper A National Health Service, which promised care that would not depend on ability to pay. Another is the decision-making approach to cost-benefit analysis of Sugden and Williams (1978), in which decision-makers are the source of values and weights. In that approach, Culyer wrote, decision-makers decide what enters the social welfare function and with what weights.

Four ways extra-welfarist evaluation departs from welfarism

Brouwer and colleagues identify four departures, listed in brief on the welfare economics page. The table adds where each shows in the NICE manual (PMG36), which does not itself use the term. The authors conclude that the main difference is the evaluative space, the set of outcomes an analysis treats as valuable, and that the other three largely follow from it.

On the last row, Brouwer and colleagues note that nobody can be sure an unhealthy person has less utility than a healthy one, but it is known that the person has less health, and the QALY lets health be compared. They treat QALYs as measures of health, not as utilities in the welfarist sense.

Health maximisation under a fixed NHS budget

Culyer wrote that the extra-welfarist approach in health economics has taken health as the proximate maximand, so that rationing should equalise the health gained per unit of resource at the margin. He described much of the cost-effectiveness literature as implicitly extra-welfarist, since it looks for the least costly way to deliver a given health improvement, which is the logic of cost-utility analysis. PMG36 (section 4.2.15) states that the use of cost-effectiveness analysis is justified by NICE's focus on maximising health gains from a fixed NHS and personal social services budget.

Claxton, Walker, Palmer and Sculpher (2010) set out the decision-making version of this argument. In a liberal democracy with a universal system such as the NHS, the health budget can be read as a legitimate, if imperfect, expression of social values. Cost-effectiveness analysis then supports a decision-maker trying to maximise health within that budget, and the cost-effectiveness threshold expresses the shadow price of the budget constraint. They see NICE as the agent of a higher authority that cannot specify a coherent social welfare function, so its analysis informs decisions without claiming to maximise social welfare.

The threshold is therefore a measure of opportunity cost in health. PMG36 (section 6.3.1) sets the maximum acceptable ICER at the opportunity cost of programmes displaced by new, more costly technologies, and sections 6.3.4 to 6.3.8 use a range of GBP 25,000 to GBP 35,000 per QALY.

Who sets the values and the weights

Brouwer and colleagues accept that extra-welfarism may be inherently paternalistic, because an authority, such as decision-makers, the general public, a committee or a citizens' jury, has to choose the outcomes, set their weights and accept changes that the Pareto criterion would not sanction. Economists, in their account, can inform these judgements and elicit values but are not equipped to make them.

Preferences keep a place. Brouwer and colleagues call it extra-welfarist to treat people who will never use a service as a relevant source of values, as PMG36 does when patients describe their health and a representative UK public sample values it (table 4.1 and section 4.3.4).

Weights show the same shift. Brouwer and colleagues cite Alan Williams's fair innings argument for more weight on QALYs gained by people who have not yet had a normal span of life, and proposals to weight gains for people with poor initial health, applied for reasons of equity and not because the marginal utility of health is presumed to diminish. NICE's severity modifier weights QALYs by absolute and proportional QALY shortfall, and PMG36 (section 6.2.11) describes decision-making modifiers as factors that go beyond QALYs and as value judgements. Equity-weighted analysis and distributional cost-effectiveness formalise such weights.

Worked example with two programmes and two verdicts

All numbers in this example are illustrative. A commissioner can fund one of two programmes, each costing GBP 1,000,000 more than current care. Programme A clears an elective hip surgery backlog in an affluent area, gains 30 QALYs and has a combined willingness to pay among its patients of GBP 1,600,000. Programme B is community mental health outreach in a deprived area, gains 45 QALYs and has a combined willingness to pay of GBP 1,200,000.

$$NB = \sum_{i} WTP_i - \Delta C$$

where $NB$ is net benefit in GBP, $WTP_i$ is the willingness to pay of beneficiary $i$ and $\Delta C$ is the incremental cost in GBP.

$$NHB = w \, \Delta E - \frac{\Delta C}{k}$$

where $NHB$ is net health benefit in QALYs, reported by PMG36 (section 4.2.16) at both ends of the range, $w$ is the weight on each QALY gained, $\Delta E$ is the incremental QALY gain and $k$ is the cost per QALY at which health is displaced elsewhere in the NHS.

1. Welfarist verdict. For A the net benefit is 1,600,000 − 1,000,000 = 600,000, or GBP 600,000, and for B it is 1,200,000 − 1,000,000 = 200,000, or GBP 200,000. A cost-benefit analysis ranks A first.

2. Money placed on each QALY. The patients of A place 1,600,000 / 30, or GBP 53,333, on each QALY and those of B place 1,200,000 / 45, or GBP 26,667. The gap reflects ability to pay, so the same health counts for twice as much money in the affluent area.

3. Health displaced. At GBP 25,000 per QALY the spending would buy 1,000,000 / 25,000 = 40 QALYs elsewhere, and at GBP 35,000 per QALY it would buy 1,000,000 / 35,000 = 28.57 QALYs. A costs GBP 33,333 per QALY gained and B costs GBP 22,222.

4. Extra-welfarist verdict with equal weights. With $w = 1$ and $k$ = GBP 25,000, A gives 30 minus 40, a net loss of 10 QALYs, and B gives 45 − 40 = 5 QALYs. With $k$ = GBP 35,000, A gives 30 − 28.57 = 1.43 QALYs and B gives 45 − 28.57 = 16.43 QALYs. B ranks first at both ends of the range.

5. A weight for need. Suppose the commissioner judges that gains in the deprived area deserve a weight of 1.2, a value judgement for this example and not a NICE rule. B's weighted gain is 45 × 1.2 = 54 QALYs, and its net health benefit at GBP 25,000 per QALY is 54 − 40 = 14 QALYs. Reporting results with and without the weight, as PMG36 section 6.3.2 asks for its own modifiers, shows how much the verdict rests on that judgement.

6. Interpretation. The evidence is fixed. The welfarist analysis prefers A because richer patients put more money on their gains, and the extra-welfarist analysis prefers B because it produces more health from the same budget. The disagreement comes from the evaluative space and the source of values, not from the data.

Extra-welfarism beyond health maximisation

Brouwer and colleagues reject the reading of extra-welfarism as health maximisation and nothing more. Health maximisation would make no sense as a goal for the whole public sector, where the framework could equally apply to education or housing, and forgone health cannot be the only opportunity cost of public money, even if it is the main one within a health care budget.

Capability measures widen the space beyond health. Robeyns and Byskov, in the Stanford Encyclopedia of Philosophy, define capabilities as the doings and beings people can achieve if they so choose and functionings as capabilities that have been realised. Culyer preferred the broader category of characteristics of people to Sen's basic capabilities, since pain or stigma matter to quality of life without being capabilities. Instruments such as ICECAP-A count benefits outside health, and the wellbeing or capability instrument page covers them.

UK central government appraisal sits closer to the welfarist tradition. HM Treasury's Green Book (2026) values effects in money wherever it can, puts a willingness-to-pay value of GBP 70,000 on a QALY in 2020-21 prices and lets analysts weight costs and benefits by the marginal utility of income. Claxton and colleagues wrote in 2010 that the Green Book reflected the welfarist tradition while health economic evaluation had generally taken a markedly different approach.

How extra-welfarism relates to neighbouring ideas

Brouwer and colleagues call extra-welfarism still a species of welfare economics and suggest that welfarism is the special case in which the evaluative space holds individual utility only. Claxton and colleagues describe cost-benefit analysis based on willingness to pay as the applied arm of welfarist economics, judged by whether gainers could in principle compensate losers, a potential Pareto improvement. A social welfare function can carry extra-welfarist arguments such as health and its distribution. One welfarist premise that extra-welfarism relaxes is individual sovereignty, the view that each person is the best judge of their own utility.

Common misreadings of extra-welfarism

Most errors come from treating one application of extra-welfarism as the whole framework. The sources above address each of these.

1. It means maximising QALYs and nothing else. Health is the usual maximand in health care, but the framework admits other outcomes, equity weights and other sectors.
2. It throws out preferences. Many extra-welfarists favour preference-based measures of health and treat the resulting numbers as measures of health.
3. QALYs are utilities, so cost-utility analysis is welfarist. Claxton and colleagues note that work reconciling cost-effectiveness with cost-benefit analysis has needed strong assumptions, such as risk neutrality over life-years and additive utility independence across time periods.
4. It has no grounding in theory. Claxton and colleagues conclude that cost-effectiveness analysis with a narrow cost perspective is not bereft of normative grounding.
5. It removes value judgements. It makes them explicit and places them with decision-makers or the public, which is why Brouwer and colleagues call it possibly paternalistic.
6. It is the same as the capability approach. Sen's work is one root, but Culyer's characteristics of people form a broader category.

Sources

• Brouwer WBF, Culyer AJ, van Exel NJA, Rutten FFH. Welfarism vs. extra-welfarism. Journal of Health Economics. 2008;27(2):325-338. https://doi.org/10.1016/j.jhealeco.2007.07.003
• Claxton K, Walker S, Palmer S, Sculpher M. Appropriate Perspectives for Health Care Decisions. CHE Research Paper 54. York: Centre for Health Economics, University of York; 2010. https://www.york.ac.uk/media/che/documents/papers/researchpapers/rp54_appropriate_perspectives_for_health_care_decisions.pdf
• Cookson R, Claxton K, editors. The Humble Economist: Tony Culyer on Health, Health Care and Social Decision Making. York: University of York and Office of Health Economics; 2012. Chapters 5 and 7, by Culyer AJ. https://www.york.ac.uk/media/che/documents/books/The%20Humble%20Economist%20corrected%20PDF%20version.pdf
• HM Treasury. The Green Book (2026). Updated 28 October 2026. https://www.gov.uk/government/publications/the-green-book-appraisal-and-evaluation-in-central-government/the-green-book-2026
• National Institute for Health and Care Excellence. NICE technology appraisal and highly specialised technologies guidance: the manual (PMG36). Published 31 January 2022, last updated 13 October 2026. Table 4.1, sections 4.2.14 to 4.2.16, 4.3.4, 6.2.10 to 6.2.18 and 6.3.1 to 6.3.8. https://www.nice.org.uk/process/pmg36
• Robeyns I, Byskov MF. The capability approach. In: Stanford Encyclopedia of Philosophy. Substantive revision 17 April 2025. https://plato.stanford.edu/entries/capability-approach/