Abstract
Consider two principles for social evaluation. The first, “laissez-faire”, says that mean-preserving redistribution away from laissez-faire incomes should be regarded as a social worsening. This principle captures a key aspect of libertarian political philosophy. The second, weak Pareto, states that an increase in the disposable income of each individual should be regarded as a social improvement. We show that the combination of the two principles implies that total disposable income ought to be maximized. Strikingly, the relationship between disposable incomes and laissez-faire incomes must therefore be ignored, leaving little room for libertarian values.
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1 Introduction
Libertarianism attributes ethical value to laissez-faire outcomes. Not in the name of efficiency or welfare maximization, but in the name of individual freedom and rights. Proponents of this political philosophy accordingly regard redistributive taxation as inherently injust. Famously, Nozick (1974, p. 169) states that “[t]axation of earnings from labor is on a par with forced labor. \(\ldots \) taking the earnings of n hours labor is like taking n hours from the person; it is like forcing the person to work n hours for another’s purpose.” Similarly, Rothbard (1973, p. 85) argues that “the entire system of taxation is a form of involuntary servitude. \(\ldots \) [p]art of the essence of slavery, after all, is forced work for someone at little or no pay.”Footnote 1
Disapproval of redistribution is not exclusive to libertarianism. It also figures as a component in the influential statements of liberal egalitarianism by Arneson (1989) and Cohen (1989).Footnote 2 They argue that only inequalities for which individuals cannot be held responsible require redistribution. That is, redistribution ought to end where responsibility begins. As Arneson (1990, p. 176) puts it, “distributive justice does not recommend any intervention by society to correct inequalities that arise through the voluntary choice or fault of those who end up with less, so long as it is proper to hold the individuals responsible for the voluntary choice or faulty behavior that gives rise to the inequalities.”
We introduce a “laissez-faire” principle to capture the ethical role for laissez-faire outcomes. To do so, we distinguish between an individual’s “market income” without government intervention and her “disposable income” after government intervention. Consider a social state in which disposable incomes coincide with market incomes. The laissez-faire principle simply says that redistribution that moves disposable incomes away from market incomes (while preserving total income) results in a socially worse social state.
We show that the laissez-faire principle, when combined with the Pareto principle, puts strong demands on the social ranking. According to the “weak Pareto” principle, an increase in the disposable income (which we assume to measure utility) of every individual is a social improvement. Our main result says that a social ranking satisfies laissez-faire and weak Pareto only if it maximizes total disposable income (Theorem 1). That is, with the exception of comparisons involving equal total disposable incomes, the social ranking must ignore distributional considerations altogether. The result is striking, as it is counter to treating the relationship between disposable incomes and market incomes as intrinsically important. We further show that there is no social ranking that satisfies the laissez-faire principle and the “Pareto indifference” principle (Theorem 2).
We provide a threefold discussion of our results. First, we clarify the relationship of our results with claims in the literature that identify Pareto indifference with a form of welfarism. This clarification is in order, as the laissez-faire principle with its reference to market incomes is clearly non-welfarist. Second, we show that the laissez-faire principle underlies the equal sacrifice principle of taxation. Our results thus allow us to draw conclusions on the extent to which the latter principle can be combined with Paretian considerations. Third, we show that our results bring to light a surprising link between the liberal reward principle, which formalizes the above-mentioned contra-redistributive idea of Arneson (1989) and Cohen (1989), and its rival principle of utilitarian reward. The intimate relationship of the laissez-faire principle with the equal sacrifice and liberal reward principles shows that our results are relevant also beyond the realm of libertarianism.
Our results reveal a strong tension between the laissez-faire principle and the Pareto principle. This poses a clear challenge for the important task of incorporating libertarian and liberal egalitarian values into the standard “Paretian” economic framework for social evaluation.
2 Results
The set of individuals is \(N = \{1,2,\ldots ,n\}\). For each individual i in N, the real number \(x_i\) denotes her disposable income (after government intervention) and the real number \(m_i\) denotes her market income (without government intervention).Footnote 3 Let \(x = (x_1, x_2, \ldots , x_n)\) and \(m = (m_1, m_2, \ldots , m_n)\). We refer to a pair (x, m) as a social state.Footnote 4 The set \(S = \mathbb {R}^n \times \mathbb {R}^n\) collects all social states. We assume that each individual ranks the social states in S in accordance with her own disposable income. That is, individual i in N weakly prefers social state (x, m) to social state \((x',m')\) if and only if \(x_i \ge x'_i\).
The aim is to compare social states on the basis of social welfare. A social ranking R is a reflexive and transitive binary relation in S. The asymmetric and symmetric parts of R (“is at least as good as”) are denoted by P (“is better than”) and I (“is equally good as”).
We impose two principles on the social ranking. The first principle expresses respect for laissez-faire outcomes. Consider a social state that gives each individual a disposable income equal to her market income. Laissez-faire demands that any redistribution (that preserves total disposable income) be regarded as a social worsening.
Laissez-faire
For all social states (x, m) and \((x',m)\) in S such that \(\sum _i x_i = \sum _i x'_i = \sum _i m_i\), if \(x = m\) and \(x' \ne m\), then \((x,m) \, P \, (x',m)\).
The second principle is a weak form of the Pareto principle. Weak Pareto requires that an increase in the disposable income of every individual be regarded as a social improvement.
Weak Pareto
For all social states (x, m) and \((x',m')\) in S, if \(x_i > x'_i\) for each i in N, then \((x,m) \, P \, (x',m')\).
Our main result says that the combination of laissez-faire and weak Pareto forces the social ranking to maximize total disposable income.
Theorem 1
If a social ranking R satisfies laissez-faire and weak Pareto, then, for all social states (x, m) and \((x',m')\) in S,
Proof
Let R satisfy laissez-faire and weak Pareto. Let (x, m) and \((x',m')\) be social states in S such that \(\sum _i x_i > \sum _i x'_i\). We have to show that \((x,m) \, P \, (x',m')\). Let \(1_n\) be the n-vector with a one at each entry.
Assume first that there is a positive real number \(\mu \) such that \(x = x' + \mu 1_n\). Then we have \((x,m) \, P \, (x',m')\) by weak Pareto.
Assume next that there is no positive real number \(\mu \) such that \(x = x' + \mu 1_n\). Let \(\delta \) be the positive real number for which \(\sum _i x_i - \sum _i x'_i = 2\delta n\).
By weak Pareto, we have
Note that \(\sum _i (x_i - \delta ) = \sum _i (x'_i + \delta )\) and, by the above assumption, \(x - \delta 1_n \ne x' + \delta 1_n\). Hence, by laissez-faire, we have
By weak Pareto, we have
Using transitivity, we obtain \((x,m) \, P \, (x',m')\). \(\square \)
We provide an example to show that there exist social rankings that satisfy laissez-faire and weak Pareto.
Example 1
For each social state (x, m) in S, let \(v(x-m)\) denote the variance of the vector \(x-m = (x_1 - m_1, x_2 - m_2, \ldots , x_n - m_n)\). Let R be the social ranking such that, for all social states (x, m) and \((x', m')\) in S, we have that (i) if \(\sum _i x_i > \sum _i x'_i\), then \((x,m) \, P \, (x',m')\) and (ii) if \(\sum _i x_i = \sum _i x'_i\), then \((x,m) \, R \, (x',m')\) if and only if \(v(x-m) \le v(x'-m')\). The social ranking R satisfies laissez-faire and weak Pareto. Note, incidentally, that R is moreover complete.
Laissez-faire and weak Pareto are surprisingly demanding if imposed jointly on a social ranking. Comparisons of social states with different total disposable incomes must be made solely on the basis of total disposable income. In all such comparisons, the social ranking must therefore ignore the relationship between disposable incomes and market incomes.Footnote 5
Proponents of libertarianism may find this implication hard to swallow. They may reject, for example, a policy that only marginally increases total disposable income, but at the cost of a major shift of disposable incomes away from market incomes.
Example 2
Assume that there are two individuals. Let (x, m) be such that \(x = m = (0,100)\) and let \((x', m)\) be such that \(x' = (100 + \varepsilon , 0)\) with \(\varepsilon > 0\). It is clear that in social state \((x', m)\) the disposable incomes and market incomes are far apart. A mild extension of laissez-faire would be that (x, m) should be socially preferred to \((x', m)\) for some small \(\varepsilon > 0\). But Theorem 1 says that \((x', m) \, P \, (x, m)\) for each \(\varepsilon > 0\).
Next, we consider the implications of strengthening weak Pareto. The “full” Pareto principle is usually defined as the combination of strong Pareto and Pareto indifference. Strong Pareto demands that if the disposable income of at least one individual increases and the disposable income of no individual decreases, then this be deemed a social improvement.
Strong Pareto
For all social states (x, m) and \((x',m')\) in S, if \(x_i \ge x'_i\) for each i in N with at least one strict inequality, then \((x,m) \, P \, (x',m')\).
Pareto indifference requires that if each individual is indifferent between two social states, i.e., has the same disposable income in both, then these two social states be regarded as socially equally good.
Pareto indifference
For all social states (x, m) and \((x',m')\) in S, if \(x_i = x'_i\) for each i in N, then \((x,m) \, I \, (x',m')\).
A direct implication of Theorem 1 is that the combination of laissez-faire and weak Pareto implies strong Pareto.
Corollary 1
If a social ranking R satisfies laissez-faire and weak Pareto, then R satisfies strong Pareto.
Pareto indifference cannot, however, be combined with laissez-faire. Hence, a social ranking that satisfies laissez-faire must violate the full Pareto principle.
Theorem 2
There is no social ranking that satisfies laissez-faire and Pareto indifference.
Proof
The proof is by contradiction. Assume that R is a social ranking that satisfies laissez-faire and Pareto indifference.
Let x and \(x'\) in \(\mathbb {R}^n\) be such that \(\sum _i x_i = \sum _i x'_i\) and \(x \ne x'\). We have \((x,x') \, I \, (x,x)\) by Pareto indifference, \((x,x) \, P \, (x',x)\) by laissez-faire and \((x',x) \, I \, (x',x')\) by Pareto indifference. Using transitivity, we obtain \((x,x') \, P \, (x',x')\). But we have \((x',x') \, P \, (x,x')\) by laissez-faire. \(\square \)
The next section discusses Theorems 1 and 2 in the light of earlier literature. We show how our results relate to the result by Kaplow and Shavell (2001) on the incompatibility between non-welfarist principles and the Pareto principle. We further connect laissez-faire with the equal sacrifice and liberal reward principles.
3 Discussion
3.1 Welfarism and Pareto
Kaplow and Shavell (2001) provide a result which they interpret as stating that a social ranking “that is not purely welfarist violates the Pareto principle” (p. 284). Their result has several ingredients in common with Theorems 1 and 2. First, the result by Kaplow and Shavell involves weak Pareto and Pareto indifference, which they equate with “the Pareto principle” and “welfarism”, respectively. Second, their result makes a claim about non-welfarist principles. Clearly, laissez-faire is a non-welfarist principle, as it renders the social ranking of social states dependent on the non-utility information, viz., the market incomes, in those social states.
For clarity, we restate and prove the result by Kaplow and Shavell (2001) in our setting. We first define continuity, which demands that small changes in a social state only cause small changes in its social ranking relative to other social states.
Continuity
For all social states (x, m) and \((x',m')\) in S, if a sequence \(\{x^{k}\}_{k\in \mathbb {N}}\) converges to x and we have \((x^{k},m) \, R \, (x',m')\) [respectively, \((x', m')\, R \, (x^{k},m)\)] for each k in \(\mathbb {N}\), then \((x,m) \, R \, (x',m')\) [respectively, \((x', m') \, R \, (x,m)\)].
What the Kaplow–Shavell result in fact establishes is that continuity and weak Pareto imply Pareto indifference.Footnote 6 Note that our proof of the result does not assume the completeness of the social ranking, does not use its transitivity and only uses upper continuity.Footnote 7
Proposition 1
If a social ranking R satisfies continuity and weak Pareto, then R satisfies Pareto indifference.
Proof
Let R satisfy continuity and weak Pareto. Let (x, m) and \((x',m')\) be such that \(x=x'\). We have to show that \((x,m) \, I \, (x',m')\).
Consider the sequences \(\{x+\frac{1}{k} 1_n\}_{k\in \mathbb {N}}\) and \(\{x'+\frac{1}{k} 1_n\}_{k\in \mathbb {N}}\). By weak Pareto, we have \((x+\frac{1}{k} 1_n,m) \, R \, (x',m')\) and \((x'+\frac{1}{k} 1_n,m') \, R \, (x,m)\) for each k in \(\mathbb {N}\). Using continuity, we obtain \((x,m) \, R \, (x',m')\) and \((x',m') \, R \, (x,m)\). That is, \((x,m) \, I \, (x',m')\). \(\square \)
We now discuss the relationship between our results and Proposition 1. First, from the combination of Proposition 1 and Theorem 2 it follows that adding continuity to the axioms in Theorem 1 produces an impossibility. There do exist social rankings that satisfy weak Pareto and laissez-faire, as Example 1 shows, but none of these social rankings satisfies continuity.
Second, Proposition 1 shows that what Kaplow and Shavell (2001) have established is essentially a connection between two components of the full Pareto principle. That Pareto indifference furthermore clashes with non-welfarist principles is not immediate. As Weymark (2017, Theorem 1) shows, the equivalence between Pareto indifference and (single-profile) welfarism is non-trivial and requires the transitivity of the social ranking.Footnote 8 The proof of Theorem 2 echoes Weymark’s insight, as it establishes the clash between Pareto indifference and laissez-faire by use of transitivity.Footnote 9
3.2 Equal sacrifice
Suppose that total market income is at least as great as total disposable income and interpret the difference as the tax burden. A question that arises is how to divide the tax burden among the individuals.
The equal sacrifice principle says that a division of the tax burden in which all individuals incur the same utility loss is socially better than a division in which some individuals lose more than others.Footnote 10 Let \(u : \mathbb {R}\rightarrow \mathbb {R}\) be an increasing function, to be interpreted as the common utility function.
Equal sacrifice
For all social states (x, m) and \((x',m)\) in S such that \(\sum _i x_i = \sum _i x'_i \le \sum _i m_i\), if \(u(x_i) - u(m_i) = u(x_j) - u(m_j)\) for all i and j in N and \(u(x'_i) - u(m_i) \ne u(x'_j) - u(m_j)\) for some i and j in N, then \((x,m) \, P \, (x',m)\).
Equal sacrifice favors taxation that preserves the utility differences associated with the market income distribution. This non-redistributive preference is clearly in the spirit of laissez-faire. It is no surprise, therefore, that equal sacrifice implies laissez-faire.Footnote 11
Proposition 2
If a social ranking R satisfies equal sacrifice, then R satisfies laissez-faire.
Proof
Let R satisfy equal sacrifice. Let (x, m) and \((x',m)\) in S be such that \(\sum _i{x_i} = \sum _i{x'_i} =\sum _i{m_i}\), \(x=m\) and \(x'\ne m\). We have to show that \((x,m) \, P \, (x',m)\).
Because \(x=m\), we have \(u(x_i) - u(m_i) = u(x_j) - u(m_j) = 0\) for all i and j in N. Because \(x'\ne m\) and \(\sum _i{x'_i} =\sum _i{m_i}\), there must exist i and j in N such that \(x'_i - m_i> 0 > x'_j - m_j\), and, hence, \(u(x'_i) - u(m_i)> 0 > u(x'_j) - u(m_j)\). Using equal sacrifice, we obtain \((x,m) \, P \, (x',m).\) \(\square \)
From the combination of Proposition 2 and Theorem 1 it follows that equal sacrifice and weak Pareto force the social ranking to maximize total post-tax income. The following example, a simple variation on Example 1, shows that there exist social rankings that satisfy equal sacrifice and weak Pareto.
Example 3
For each social state (x, m) in S, let \(v(u(x)-u(m))\) denote the variance of the vector \((u(x_1) - u(m_1), u(x_2) - u(m_2), \ldots , u(x_n) - u(m_n))\). Let R be the social ranking such that, for all social states (x, m) and \((x', m')\) in S, we have that (i) if \(\sum _i x_i > \sum _i x'_i\), then \((x,m) \, P \, (x',m')\) and (ii) if \(\sum _i x_i = \sum _i x'_i\), then \((x,m) \, R \, (x',m')\) if and only if \(v(u(x)-u(m)) \le v(u(x')-u(m'))\). The social ranking R satisfies equal sacrifice and strong Pareto. Note, incidentally, that R is complete and violates continuity and Pareto indifference.
We end with a remark analogous to that regarding Example 2. The scope to further strengthen equal sacrifice is severely limited. Even a mild strengthening that recommends foregoing an arbitrarily small amount of total disposable income in exchange for a substantial reduction in the inequality of individual utility sacrifices would clash with weak Pareto.
3.3 Liberal and utilitarian reward
Imagine that an individual’s market income is determined by ethically arbitrary circumstance characteristics (e.g., parental background) as well as ethically significant responsibility characteristics (e.g., work effort). Then two principles emerge. First, the principle of compensation, which imposes aversion to the income inequalities caused by differences in circumstances. Second, the principle of reward, which calls for an absence of aversion to the income inequalities due to differences in the exercise of responsibility. As we are only interested in the principle of reward here, we assume that all individuals have identical circumstances and, therefore, differ only with respect to responsibility.Footnote 12
The principle of reward comes in two rival forms, liberal and utilitarian reward, each of which gives a different meaning to the idea of “absence of inequality aversion”.
Liberal reward demands that the inequalities present in the market income distribution be respected.Footnote 13 It says that, for a given market income distribution, the division of total disposable income that exhibits the same pairwise income inqualities as does the market income distribution is socially preferable to other divisions of the total.
Liberal reward
For all social states (x, m) and \((x',m)\) in S such that \(\sum _i x_i = \sum _i x'_i\), if \(x_i - x_j = m_i - m_j\) for all i and j in N and \(x'_i - x'_j \ne m_i - m_j\) for some i and j in N, then \((x,m) \, P \, (x',m)\).
Utilitarian reward requires that the social ranking be inequality neutral.Footnote 14 In other words, the social ranking should maximize total disposable income. We formulate a version of utilitarian reward that applies only to the asymmetric part of the social ranking.
Utilitarian reward
For all social states (x, m) and \((x',m')\) in S, we have that \(\sum _i x_i > \sum _i x'_i\) implies \((x,m) \, P \, (x',m')\).
It is immediate that liberal reward implies laissez-faire.Footnote 15 The combination of this implication and Theorem 1 yields the simple but striking result that the liberal reward principle, when combined with weak Pareto, implies the rival utilitarian reward principle.Footnote 16
Corollary 2
If a social ranking R satisfies liberal reward and weak Pareto, then R satisfies utilitarian reward.
We again end on a note of pessimism regarding the scope to strengthen liberal reward. Even a modest strengthening that recommends sacrificing an arbitrarily small amount of total disposable income in exchange for disposable income differences substantially closer to market income differences would clash with weak Pareto.Footnote 17
4 Conclusion
The economic literature has traditionally stressed the role of laissez-faire as an instrument for welfare maximization. Our results show the difficulties in treating the respect for laissez-faire outcomes as an end in itself. If the full Pareto principle is required, then no social ranking can satisfy the laissez-faire principle. If only weak Pareto is required, then there are possibilities, but these are very restricted. In cases where the social states differ in total disposable income, market incomes must be ignored and the social state with greater total disposable income must be chosen, leaving little room for libertarian values.
Notes
See Huemer (2018) for a recent libertarian case against redistribution.
Because of individual responses to government intervention, incomes “before” intervention need not coincide with incomes “without” intervention. The latter are the ones relevant for our purpose.
We sketch how the result extends to a setting with multiple commodities. For each individual i in N, redefine \(x_i\) and \(m_i\) to be, respectively, i’s consumed commodity bundle and market commodity bundle in \(X = \mathbb {R}^m\). Let \(R_i\) denote individual i’s preference relation defined on the set of consumed commodity bundles X. We assume that \(R_i\) is complete, transitive, continuous and strictly monotonic, and use \(P_i\) to denote its asymmetric part. The set \(S = X^n \times X^n\) collects all social states and R is a social ranking in S. In this setting, weak Pareto is defined as follows: for all social states (x, m) and \((x',m')\) in S, if \(x_i \, P_i \, x'_i\) for each i in N, then \((x,m) \, P \, (x',m')\). Laissez-faire becomes: for all social states (x, m) and \((x',m)\) in S such that \(\sum _i x_i = \sum _i x'_i = \sum _i m_i\) and \(x_i \, P_i \, x'_i\) for some i in N, if \(x = m\) and \(x' \ne m\), then \((x,m) \, P \, (x',m)\). The additional condition that there be at least one individual who prefers (x, m) to \((x',m)\) prevents a direct clash with weak Pareto. For two commodity bundles y and \(y'\) in X, we write \(y>y'\) if y is greater than \(y'\) for some commodity and is no less for any other. We obtain the following extension of Theorem 1: if a social ranking R satisfies laissez-faire and weak Pareto, then, for all social states (x, m) and \((x',m')\) in S such that \(x_i \, P_i \, x'_i\) for some i in N, we have that \(\sum _i x_i \, > \, \sum _i x'_i\) implies \((x,m) \, P \, (x',m')\).
See Suzumura (2001) for more relationships between various versions of the Pareto principle.
Campbell and Kelly (2002, pp. 80–81) similarly mention that the proof of Kaplow and Shavell does not use transitivity and does not require full continuity.
Single-profile welfarism requires that there exist a binary relation in utility space that represents the social ranking for a fixed profile of individual utility functions. Multi-profile welfarism requires that there exists a single such binary relation for all profiles of individual utility functions. This distinction is key in the debate between Kaplow and Shavell (2001, 2004) and Fleurbaey et al. (2003), with the former defending the single-profile version and the latter the multi-profile version of welfarism. See Suzumura (2011, p. 675) and Weymark (2017, p. 292) for further commentary.
Let x and \(x'\) in \(\mathbb {R}^n\) be such that \(\sum _i{x_i} = \sum _i{x_i}\) and \(x \ne x'\). For a social ranking R that satisfies single-profile welfarism, we have \((x,x) \, P \, (x',x)\) if and only if \((x,x') \, P \, (x',x')\). The clash with laissez-faire is immediate and does not require the transitivity of R.
This does not mean that libertarians endorse equal sacrifice taxation. For example, Rothbard (1977, p. 151) after observing that the principle “asks that equal hurt be imposed on all” concludes that “[a]s a criterion of justice, this is as untenable as asking for equal slavery.”
That liberal reward implies a preference for laissez-faire if all individuals have the same circumstances has been noted before: see, e.g., Fleurbaey (2008, p. 10). Further, observe that liberal reward is related to equal sacrifice. Restricting to social states in which total market income is at least as great as total disposable income, we obtain liberal reward from equal sacrifice by setting the common utility u equal to the identity function.
Example 1 suffices to illustrate that there exist social rankings that satisfy liberal reward and strong Pareto.
However, if we impose that the market income distribution m is fixed, then there do exist social rankings that satisfy both full Pareto and this strengthening of liberal reward. As an example, consider a social ranking R that applies the Kolm-Pollak social welfare function (Kolm 1976; Pollak 1971) to differences between disposable and market income. That is, there exists a real number \(\alpha > 0\) such that, for all social states (x, m) and \((x', m)\) in S, we have \((x,m) \, R \, (x',m)\) if and only if \(\sum _{i}{-e^{-\alpha (x_i-m_i)}} \ge \sum _{i}{-e^{-\alpha (x'_i-m_i)}}\). See Bosmans and Öztürk (2021) on social rankings in this vein. Note that similar options are available in the context of the equal sacrifice principle. Incidentally, the above example illustrates that non-utility information, in this case the market incomes in m, can play an important role in a welfarist social ranking if this information does not vary across social states (see also Weymark 2017, p. 207).
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Bosmans, K., Öztürk, Z.E. Laissez-faire versus Pareto. Soc Choice Welf 58, 741–751 (2022). https://doi.org/10.1007/s00355-021-01373-4
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DOI: https://doi.org/10.1007/s00355-021-01373-4