...a theory of justice that can serve as the basis of practical reasoning must include ways of judging how to reduce injustice and advance justice, rather than aiming only at the characterization of perfectly just societies – an exercise that is such a dominant feature of many theories of justice in political philosophy today.

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Libertarian logic for non-interference, when consistently exp­lored, can have extraordinarily stern implications in invalidating the right to assistance from the society when one is hit by self-harming behaviour. If that annulment is not accepted, then the case for libertarian “immunity” from interference is also correspondingly undermined.
We should not readily agree to be held captive in a half-way house erected by an inadequate assessment of the demands of liberty.

I agree with Mr Wolf that freedom is centrally important. But how should we see the demands of freedom when habit-forming behaviour today restricts the freedom of the same person in the future? Once acquired, the habit of smoking is hard to kick, and it can be asked, with some plausibility, whether youthful smokers have an unqualified right to place their future selves in such bondage.
A similar issue was addressed by the leading apostle of liberty, John Stuart Mill, when he argued against a person’s freedom to sell himself or herself in slavery. […] Another question to ask is: who exactly are the “others” who are affected? Passive smokers are not the only people who might be harmed. If smokers are made ill by their decision to go on smoking, then the society can either take the view that these victims of self-choice have no claim to public resources (such as the National Health Service or social safety nets), or more leniently (and I believe more reasonably) it could accept that these people still qualify to get social help. If the former, we would live in a monstrously unforgiving society; and happily I do not see Britain or France going that way. If the latter, then the interests of “others” would surely be affected through the sharing of the costs of public services.

Since the conception of human rights transcends local legislation and the citizenship of the person affected, it is not surprising that support for human rights can also come from anyone—whether or not she is a citizen of the same country as the person whose rights are threatened. A foreigner does not need the permission of a repressive government to try to help a person whose liberties are being violated. Indeed, in so far as human rights are seen as rights that any person has as a human being and not as a citizen of any particular country, the reach of the corresponding duties can also include any human being, irrespective of citizenship.

I am not persuaded that Hayek got the substantive connections entirely right. He was too captivated by the enabling effects of the market system on human freedoms and tended to downplay - though he never fully ignored - the lack of freedom for some that may result from a complete reliance on the market system, with its exclusions and imperfections, and the social effects of big disparities in the ownership of assets. But it would be hard to deny Hayek's immense contribution to our understanding of the importance of judging institutions by the criterion of freedom.

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Reasoning is a robust source of hope and confidence in a world darkened by murky deeds – past and present. It is not hard to see why this is so. Even when we find something immediately upsetting, we can question that response and ask whether it is an appropriate reaction and whether we should really be guided by it. Reasoning can be concerned with the right way of viewing and treating other people, other cultures, other claims, and with examining different grounds for respect and tolerance.

That austerity is a counterproductive economic policy in a situation of economic recession can be seen, rightly, as a “Keynesian critique.” Keynes did argue—and persuasively—that to cut public expenditure when an economy has unused productive capacity as well as unemployment owing to a deficiency of effective demand would tend to have the effect of slowing down the economy further and increasing—rather than decreasing—unemployment. Keynes certainly deserves much credit for making that rather basic point clear even to policymakers, irrespective of their politics, and he also provided what I would call a sketch of a theory of explaining how all this can be nicely captured within a general understanding of economic interdependences between different activities... I am certainly supportive of this Keynesian argument, and also of Paul Krugman’s efforts in cogently developing and propagating this important perspective, and in questioning the policy of massive austerity in Europe.
But I would also argue that the unsuitability of the policy of austerity is only partly due to Keynesian reasons. Where we have to go well beyond Keynes is in asking what public expenditure is for—other than for just strengthening effective demand, no matter what its content. As it happens, European resistance to savage cuts in public services and to indiscriminate austerity is not based only, or primarily, on Keynesian reasoning. The resistance is based also on a constructive point about the importance of public services—a perspective that is of great economic as well as political interest in Europe.

Central to the Smithian approach is our willingness to see critically what we observe around us. The sense of comfort that is often associated with being content with the world as it is can seriously hamper the pursuit of justice. This understanding goes strongly against a line of thought that was powerfully presented by Friedrich Nietzshe. ‘The Christian resolve to find the world ugly and bad has made the world ugly and bad’, said Nietzshe. I think I can, with some effort, understand what Nietzsche meant, but it is hard for me, even with a lot of effort, to see that Nietzshe’s hypothesis helps us to understand the causation or resilience of the nastiness of the world in which we live. Nor, I must insist (this I do as a thoroughly unreligious person), does it offer any obvious insight into the lives and achievements of Martin Luther King, or Mother Theresa, or Desmond Tutu, who have tried to reduce injustice in the world and have done so with non-negligible success.

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The enormous standing of Pareto optimality in welfare economics, as was argued earlier, relates closely to the hallowed position of utilitarianism in traditional welfare economics (before questions were raised about the possibility of interpersonal comparisons of utility). If interpersonal comparisons of utility are dropped, but nevertheless utility is regarded as the only thing of intrinsic value, then Pareto optimality would be the natural surviving criterion, since it carries the utilitarian logic as far forward as possible without actually making any interpersonal comparisons of utility.