Mixed Constitutions vs. Mixed Economies (or, Ancient and Modern Liberalisms)

(Attention conservation notice: Inspired by a student’s comment a while back, this has languished in my drafts folder. Contains speculative intellectual history, implausible connections between ancient and modern concepts, and self-promotion; nevertheless, I thought it would be worth trying out the argument)

The ancient Greco-Roman idea of the “mixed constitution” is usually taken to be the ancestor of modern (post 18^th-century) constitutional ideas about “checks and balances” and the “division of powers.” This is fine as far as it goes; the early modern writers who first proposed and defended these latter ideas in a systematic way – people like Harrington, Locke, and  Montesquieu, for example – seem to have been influenced to some degree by Greek and Roman theories of the mixed constitution. They used these ideas as one of the lenses through which they interpreted British constitutional practice of the 17^th and 18^th centuries; and there is certainly a sort of family resemblance between the ancient idea about the need for “mixture” in a constitution and the modern idea that a constitution should implement some checks on state power through the functional division of authority among different “branches” of the government.

However, as many people have noted, ancient ideas about the mixed constitution are in many ways quite different from modern ideas about the need for a functional division of authority to prevent abuses of state power. Even the guiding metaphors are different: “mixture” and “separation” denote contrary ideas. But perhaps more importantly, it strikes me that ideas about the mixed constitution played a role in ancient Greco-Roman political discourse that is very different from the role that ideas about “checks and balances” came to play in modern political discourse, and that is in fact surprisingly similar to the role ideas about the “mixed economy” – an economy that incorporates both market mechanisms and government intervention – play in contemporary political thought. I don’t mean this as a claim about intellectual history: ideas about the “mixed economy” today clearly owe nothing to ancient ideas about the mixed constitution. I mean it as a claim about the conceptual place of ideas within particular discourses or debates. Let me try to explain.

As I argue in much pedantic detail in a piece I published last year somewhat misleadingly entitled “Cicero and the Stability of States” (History of Political Thought 32(3): 397-423 [gated, ungated] – the first half is a survey of ideas about the mixed constitution in Plato, Aristotle, and Polybius), ancient ideas about the mixed constitution have two strands.

On the one hand, there is a concern with domination by powerful people and groups. Here the idea of the mixed constitution serves as a model of the “constraints” that should be imposed on the powerful to prevent tyranny, and in this sense it plays a very similar role to ideas of “checks and balances.” However, whereas modern discussions about the separation of powers tend to emphasize the need for a functional division of the tasks of government (into legislative, executive, and judicial activities, for example) to prevent abuses of state power, ancient discussions of the mixed constitution tend instead to emphasize a social division of power among significant social groups to prevent its monopolization (a group “becoming” the state, so to speak). The “simple” or “unmixed” regimes are precisely those regimes where one social group – the rich, the poor, military leaders – monopolizes power (for good or ill; the unmixed regimes are not always considered bad, but they are always considered fragile for a variety of reasons); by contrast, the “mixed” regimes are precisely those where power is “shared,” or, metaphorically, these are the regimes which "mix" the monopolistic regimes so that no social group has uncontested dominance over the others.

To put the point very roughly, I suspect the modern emphasis on separating power goes hand in hand with an emerging consciousness of “the state” as a distinct unified institutional actor that can develop interests that are independent of those of other significant social groups (including dominant groups), and hence is concerned with the institutional mechanisms that can limit its ability to act in dominating ways; ancient political thought, by contrast, has no such consciousness of a “state” as distinct from the social groups that exercise political power (most Ancient Greco-Roman societies had nothing like a state in the Weberian sense of the word anyway), and hence is more concerned with the compromises that various groups need to make to share power stably in ways that are beneficial to all. This is only an imprecise sketch of a complex history, of course. After all, early modern liberal political thought was often also concerned with the problems posed by the domination of one social group over another; 19^th century debates about suffrage are full of fears about what would happen if the poor were allowed to directly elect representatives and hence dominate the state, for example. And 17^th and 18^th century notions of “estate representation” do fit in quite naturally with ancient ideas about mixed constitutions.  Yet I am tempted to speculate in a vaguely Marxist way that ancient Greco-Roman political thought was more attuned to the permanent class conflicts of agrarian societies than early modern liberal thought, perhaps because the latter in part grew out of reflections on the management of confessional or sectarian conflicts in which the state was never merely a class agent, unlike the former.

At any rate, this concern with “sharing” power among significant social groups leads to a second strand of thought about political “mixture.” Here the idea of the mixed constitution serves as a model of the compromises that are possible and necessary between groups whose conceptions of justice – their conceptions of the appropriate distribution of the “benefits and burdens” in the community, their ideas about the appropriate level of hierarchy and equality in the organization of society, and so on – differ systematically according to their positions in society. For example, both Plato and Aristotle (and to a lesser degree other extant writers) suggest that the poor and the rich develop conceptions of justice that have a certain “bias” towards their own structural position: while the poor or the people tend to develop a conception of justice that emphasizes their equality as citizens, and hence the need for an equal distribution of power and authority in the community (expressed most radically in the lotteries of Athens), the rich or the elite tend to develop a conception of justice that emphasizes their inequality – their distinctiveness – and hence the need for an unequal distribution of power and authority (expressed in the demand for closed oligarchies and in justifications that claim the right to rule for those who contribute the most to the community, or those who are wisest, or have the most military virtue). Conflict between major social groups is not simply a clash of naked self-interest (at least not always), but rather appears as a contest between rival moralized conceptions of hierarchy, equality, and fair distribution.

For these Greek (and later Roman) writers, the key theoretical problem thus turns out to be how to bridge these divergent conceptions of justice for the sake of political stability while also promoting as far as possible various other important goods – freedom, independence, the effectiveness of the community as a fighting force, social solidarity, prudent decisionmaking, etc. How can political power be shared so that these contrasting conceptions of justice can all find some place in the community without monopolizing the whole, while maintaining a viable, even flourishing society in other respects? 

This problem is complicated both by material factors (extreme inequality makes it difficult to bridge the conceptions of justice of significant social groups, in the view of most of the extant Greek writers who talk about this problem) and by the fact that these group-relative conceptions of justice, however faulty, cannot be fully “educated away.” That is, whatever the truth of the matter about justice is (and Greek and Roman thinkers thought this was an answerable question) it is simply not possible to consistently convince people in structurally different positions that their conceptions of justice are incorrect. (At best, education can soften the edges of those differing conceptions of justice, but not transform them consistently). The “mixed constitution” is then an attempt to describe how one might give all these different conceptions of justice – or different ideas about what is valuable, or what gives people title to rule – some place within the polity despite the fact that they are partially incorrect (because one-sided) and hence in some ways damaging to the community, and despite the fact that they cannot be "corrected," while not wholly sacrificing other important values. In Plato, for example, the test of a well-organized mixed constitution is that it balances the characteristic values associated with “democracy” (where the poor or the many are dominant) and “monarchy” (a synecdoche for all regimes where small elites are dominant) so as to promote philia (social solidarity), eleutheria (freedom and political independence) and phronesis (prudent decisionmaking). Let me quote myself:

The Athenian Stranger [the main speaker in Plato’s Laws] suggests that a constitution can achieve these three objectives by “mixing” in the right proportion the values traditionally associated with monarchy, especially Persia, and the values traditionally associated with democracy, especially Athens (693d). “Monarchical” values emphasize subordination and status hierarchies, and thus enhance the coordination of action necessary to effective military power, i.e., the kind of power that ensures eleutheria as political independence (694a). But if they are over-emphasized, they disrupt both the solidarity and affection (philia) between rulers and ruled and the ability of information and insight to flow to the rulers (phronesis; 694a-b), increasing the city’s vulnerability to external forces and diminishing the ability of rulers to actually rule for the common good (697d-698a). By contrast, “democratic” values emphasize personal autonomy and equality, and thus enhance the solidarity and affection between rulers and ruled as well as the flow of information throughout the city, which makes the city able to defend itself intelligently at least so long as it can coordinate its actions through its laws and rulers even against vastly superior forces (cf. 698b-699d). But if they are over-emphasized, the city loses both its ability to recognize and defer to actual expertise (and hence loses intelligence; cf. 701a) and the ability to coordinate properly that submission to laws and rulers provide. It thus disintegrates into “every man for himself” (cf. 699c-d), again making it vulnerable to external forces.

Properly constructed institutions will ensure that the citizens will be properly submissive to the laws and the rulers (indeed, that they will “fear” and “revere” the laws and the rulers, cf. 698b), but will also grant enough personal autonomy and ensure enough status equality to ensure that phronesis flows through the city and rulers and ruled share enough affection for each other. Such a constitution will “weave together” the “mother constitutions” of monarchy and democracy (693d) in the sense that it will induce a measured combination of their characteristic values capable of simultaneously ensuring solidarity and affection between rulers and ruled, intelligence in the actions of the city, and the preservation of its political independence. (moi, pp. 403-404)

Though “liberalism” as such did not exist in the Ancient Greco-Roman world, the idea of the mixed constitution thus seems to me to be designed to deal with problems similar to those that have motivated much modern liberal thought: how to deal with intractable conflicts of value (about justice, in this case) when no significant social group can be assumed to have a monopoly on the truth (the philosopher does not count as a social group, even if she does have the truth about justice) in a relatively peaceful way. But ancient mixed constitution thinking (at least the mostly Greek variant of it before Cicero that has come down to us), unlike classical liberalism, tended to see these problems in the context of deep-seated, ineradicable distributional conflicts; and as such, it seems to me, it played a role in political thought similar to the role the idea of a “mixed economy” plays today.

Modern economic debates about the role of the state in the economy are obviously never merely technical debates; they usually invoke, either implicitly or explicitly, different conceptions of justice and fairness, and different answers to the question about the kinds of power that partisans of these conceptions of justice and fairness ought to have in society. (Consider: "taxation is theft" vs. "you didn't build that"). They are debates about what is the right distribution of burdens and benefits in society, and draw on deep-seated intuitions about desert, property, and the like that appear to vary among distinct social groups. The idea of a mixed economy then serves as a model – varying in detail depending on its particular proponent, of course – of the appropriate distribution of social power among partisans of different conceptions of distributive justice, including both a description of the kinds of constraints that should be imposed on powerful social groups (e.g., how democratic states should constrain markets and vice-versa) and a description of the kinds of compromises that partisans of particular ideas of fairness or justice must make while still promoting efficiency (the modern equivalent of the Platonic “prudent decisionmaking” or phronesis), common identity (the modern equivalent of the Platonic philia), and personal autonomy (the modern equivalent of eleutheria).

Proponents of a mixed economy of course disagree about the specific institutions of that would instantiate it properly, just as Plato, Aristotle, Polybius, and Cicero had different views about proper mixture in a constitution. My point is more about how the abstract model of the mixed economy seems to serve as a reference point for attempting to find pragmatic compromises among social groups with ineradicably different views concerning distributive justice and enduring, if unbalanced, forms of social power (numbers vs. economic power, for example) even if we think that some of these views are correct (or more correct than others). We might say that like the mixed constitution in antiquity, the mixed economy today serves as a standard description of the second best.

Update 7 August: fixed some oddities of grammar and missing words.

Pet peeves: the neglect of ancient concepts, a continuing series

(Warning: some complaints about the neglect of ancient concepts by classical scholars). 


I just read a nice piece by W. Jeffrey Tatum on "Roman Democracy?"  in the Blackwell Companion to Greek and Roman Political Thought that makes a good case for taking the "democratic" features of the late republican Roman political system seriously, contrary to the common opinion among scholars since the late 19th century that republican Rome was essentially a senatorial oligarchy. 


Tatum sensibly notes that Rome was not a full democracy in the strong sense of the term (pace Fergus Millar), yet he also seems needlessly dismissive of Polybius' and Cicero's judgment that the Roman constitution was "mixed" (pp. 215, 223). Rather, he seems to want to classify Rome as some kind of imperfect democracy, and in the process of casting about for a suitable concept ends up suggesting that Rome was a "delegative democracy" (p. 226). This is a term invented by my old teacher Guillermo O'Donnell to describe political systems like that of Argentina under Menem or Peru under Fujimori, but it is wholly unsuitable for describing the late Roman republic: a "delegative democracy" is a democracy without mechanisms of horizontal accountability, and the Roman republic certainly did not lack that! 


Why not simply say that the best way of describing the Roman political system is through something like the Polybian concept of the "mixed" constitution, or alternatively through the concept of a "hybrid" regime, to use contemporary terminology (though the concept of a hybrid regime today is much less well developed and lacks the normative associations of the idea of the mixed constitution)? The evidence Tatum cites shows quite well that the Roman regime fits the basic ancient criteria for classification as a mixed constitution. It involved a number of distinct centers of power with with complementary but also competing interests (the tribunes, whose power derived from their connection with the popular assemblies and their ability to veto senatorial proposals; the senate, which was the executive committee of the Roman upper classes; and the consuls, whose power derived from their control of military forces in the field) which were not always equally balanced against each other, to be sure, but then again the idea of the mixed constitution did not require that its constituent parts be fully balanced. And it is true that the idea of the mixed constitution had a large normative baggage and implied a certain theory about political stability (which I am currently exploring in this project), but that is no reason to abandon it entirely. 


Aside from concerns about the overwhelming dominance of the senate (which are basically refuted by Tatum), scholars tend to argue that Rome could not be a "mixed" constitution in the Polybian sense because the consuls (the "monarchical" element in the constitution, in the Polybian scheme) were senators and returned to that body, representing senatorial interests all the time. But it seems reasonably clear that in Rome the consuls' power derived not just from the senate, but from their control of armed force and their ability to extract resources from the provinces (as proconsuls after their terms); so Polybius' characterization of the consuls as the "monarchical" center of power (cf. πολιτευμάτων, Histories 6.10.6, which it seems to me could be translated as such) does not seem far-fetched. 


So why the dismissive attitude towards the ancient conceptual apparatus? Rather than throw it out, why not develop it further and see whether it can be adapted to modern conditions? (Another example in the same book: the piece by Forsdyke on the idea of tyranny in classical thought. She seems to suggest that the notion of tyranny in the 5th and 4th centuries was simply a tool in the ideological struggle between the upper and lower classes in the polis, rather than an attempt to actually grasp a real phenomenon, however imperfectly, though the last lines of the piece soften the impression a bit). 

Polybius and the Dialectic of Forgetting (Or, Theoretical Models in the Classical World)

(Warning: A very long footnote – 2,500 words - about Polybius, human moral psychology, and the use of “models” in the Classical World, written as part of research for this project.)

The extant fragments of book VI of Polybius’ Histories contain a famous (in certain circles) discussion of the “cycle of regimes” (VI.5.10-9.14). The story goes more or less like this.

Human beings start in something like the “state of nature,” without arts or sciences, and in particular without highly developed moral norms, where we herd together like other animals following the strongest or most daring man (the basic primate pattern, we might say today: I can’t help viewing a lot of the stuff I’m reading right now through the lens of Boehm’s book, and this post will be no exception). This is what Polybius calls “monarchy” (μοναρχίαν), where the authority of the leader is limited by his physical strength and daring. This sort of “natural monarchy” then evolves towards kingship (βασιλεία) properly speaking, which is no longer a simple hierarchy sustained by strength and daring but a moral community where the authority of the leader is very much constrained by relatively egalitarian ideas about justice. In such a community, the king does not attempt to distinguish himself from his subjects by their dress or in their food and drink, and he gains the support of others only insofar as he coordinates the enforcement of community norms (VI.6.11-12), even as he may be weak and infirm; tendencies to domination are effectively kept in check.

Polybius explains the development of these ideas about justice as the result of spontaneous reflection about reciprocity (VI.6.5-10): because we expect others to reciprocate our good deeds, and value the good deeds of others, norms codifying those expectations emerge, in turn sustaining the authority of those leaders who coordinate their enforcement. Our “natural” ideas of justice are thus quite egalitarian (cf. the use of “democratic” language to describe these norms in all regimes: VI.8.4 πολιτικῆς ἰσότητος καὶ παρρησίας, VI.9.4 τὴν ἰσηγορίαν καὶ τὴν παρρησίαν), though they will accommodate some hierarchy to the degree that a leader can enforce them. But Polybius argues that this sort of “egalitarian” kingship is not stable; insofar as kingship becomes hereditary (something that is common, Polybius suggests, due to the popular belief in the inheritability of virtuous dispositions) it develops necessarily into tyranny, i.e., a regime where egalitarian community norms no longer constrain the leader. The increase in the security of the position of the king’s heirs, which comes also as a result of other changes (e.g., the emergence of resources such as fortified places that can be monopolized by the leader), increases their temptations to try to dominate others. They begin by trying to distinguish themselves from the others by dress or other signals (VI.7.7), and end by trying to obtain more material resources and reproductive advantages than anyone else in the community. The basic mechanism of change in the Polybian theory of change appears here for the first time: security of position enhances a human tendency to domination (as I was writing this, I came across this recent piece by Ryan Balot that makes a similar point).

But this tendency to domination is counterbalanced by an apparently equally natural tendency to resent domination in the name of the earlier egalitarian community norms. The “best” men – those who are most high-spirited and resentful of domination – will tend to rise up and overthrow the tyrant in the name of these norms, setting themselves up in their place. As speculative political history and anthropology, this is perhaps not self-evident (why would tyranny necessarily give rise to aristocracy rather than democracy or a renewed kingship?), though in general I think Polybius gets the basic features of long-run political development right, even if modern anthropologists would insist on a finer gradation of steps from the basic primate hierarchy to relatively acephalous egalitarian societies to “big man” societies to the kind of morally constrained “chiefdom” that corresponds to Polybius’ notion of kingship and eventually to tyranny. At any rate, the transition from tyranny to aristocracy does fit the history of Rome well enough (and remember, Polybius is writing a history of the growth of Roman power). But as a depiction of a common political psychology, Polybius’ idea is very much on target, insofar as human nature does seem to contain both tendencies towards domination (at least among males) and tendencies to resent domination, and our “default” social norms are mostly egalitarian.

We could thus say that political change, in the Polybian story, is all about the emergence of egalitarian norms, their violation by individuals capable of accumulating resources, and the restoration of such norms by those outside the “winning coalition” who still value such norms. The pattern is repeated at the next step in the cycle. As time and generations pass, the sons of aristocrats become again secure in their position, and again engage in attempts to dominate others in contravention of community norms: this is the beginning of oligarchy. Polybius describes how these new leaders no longer have any experience of the previous egalitarian norms (ἄπειροι δὲ καθόλου πολιτικῆς ἰσότητος καὶ παρρησίας), and have forgotten the misfortunes that led their parents to rise up against tyrants (VI.8.4-5). There is a kind of normative drift: signs of distinction that had been freely given to their parents for their services are interpreted by their sons as things that they deserve naturally, so that the relatively egalitarian norms that had regulated the conduct of their parents no longer regulate their own conduct. What happens instead is that the oligarchs abandon begin to pursue unrestrainedly material and other advantages: they take from others without reciprocating. But the egalitarian norms still remain strong within the rest of the population, and so eventually the people rise up and overthrow the oligarchs, banding behind any leaders who credibly promise to enforce the old moral norms. The people, however, remember with fear both the kings (and their transformation into tyrants) as well as the more recent oligarchs (note the emphasis on memory, which is partly the historian’s domain); they thus decide to manage their affairs by themselves, and democracy is born.

In democracy, as in aristocracy or kingship before, egalitarian norms remain strong as long as some are alive who experienced the previous form of domination; but when the experience is lost (with the grandchildren of the founders of democracy, VI.9.4-5), their influence weakens. People begin to take such norms for granted, and those with resources (the wealthy) begin to attempt to “aim at pre-eminence,” i.e., attempt to dominate others. This competitive struggle among rich individuals sets in motion a process of far-reaching social disintegration, where each wealthy individual corrupts the people by turning their desires in the direction of material accumulation and accustoming them to getting what they want by raiding the wealth of other wealthy individuals. This turns the democracy into a rule of violence (χειροκρατίαν), where multiple demagogic leaders compete to dominate by promising each other’s wealth to the people; the process ends with the masses turning into beasts again (cf. ἀποτεθηριωμένον, VI.9.9), i.e., returning to the state described at the beginning of the cycle, herding like the other animals without real social norms, and eventually getting a new “master,” a new leader who is only limited by his capacity for violence, though under social conditions that are different from those operating at the beginning of the cycle.

In summary, Polybius claims that simple regimes develop according to the following cyclical pattern: pre-social state of nature/natural monarchy->;kingship->;tyranny->;aristocracy->;oligarchy->;democracy->;mob rule/post-social state of nature->;natural despotic monarchy (repeat). This “theory” has sometimes been criticized by modern scholars (see, e.g., von Fritz, p. 84) for its apparently “deterministic” or “rigid” sequence of changes, and indeed Polybius’ presentation is a far cry from the nuanced discussions of political change found in Plato (on which he claims to draw, though Polybius’ discussion is very different from what we find in books VIII and IX of the Republic and in the Statesman) and Aristotle (whose discussions of the problem of political change in book V of the Politics he may not have known, given the possible loss from public view of a lot of Aristotelian writing between the third and the first century ADBC). Moreover, the “theory” of the cycle of regimes sits uneasily with Polybius’ “historical” sensibilities; it is abundantly evident to any observer of historical reality that regimes sometimes change in ways that do not fit a clear pattern (as it was to Aristotle, for example, who criticized – wrongly - Plato for a similar idea). Democracies sometimes turn into oligarchies (as when the Thirty took power in Athens in 404BC), monarchies into democracies, and in general any kind of regime into any other kind, as Aristotle documented in exhaustive detail in book V of the Politics. Writers who knew their Polybius well often tactfully pointed this out after summarizing Polybius’ “theory.” Thus Cicero notes in De Re Publica I.68, after a discussion of regime change that is obviously influenced by Polybius, that regimes tend to change in ways that do not necessarily fit any simple pattern (a remark that is attributed to Scipio, who had been a friend of Polybius in real life), and Machiavelli notes that a community would be unlikely to experience all the stages of change described in the theory before it was taken over by a more stable and better organized state (Discourses I.2 – there is a bit of a puzzle here, for though Machiavelli is clearly describing something like Polybius’ theory, he knew no Greek, and book 6 of Polybius had not been translated at the time). Given that Polybius was not politically or historically naïve, it seems unlikely that these observations would have escaped him.

Yet the criticism is unfair. Polybius explicitly indicates that he is simplifying the “more precise” discussions found in Plato and other philosophers (VI.5.10), which he finds too complicated for pragmatic purposes. The “simplified” theory of the cycle of regimes is not to be taken as an accurate representation of historical reality, but as something like a “model” in the sense in which economists use the term: a distillation of the incentives and other influences affecting the main political actors in a regime, and pragmatically useful as a tool for analyzing political changes in more complex regimes, like the Roman one. (Polybius’ “solution” to the difficulties of the cycle, the “mixed regime,” is also best understood as that sort of model, though that is a subject for another post). These incentives are not simply incentives to behaviour (as in much modern rational choice theorizing) but to character: the model describes how certain characters emerge endogenously from certain regimes, given some assumptions about human nature and about the preservation of historical memory.

What is especially neat about Polybius’ presentation of the “cycle” of regimes is how he ties experience and forgetting with the natural tendencies to both attempt and resent domination in the explanation of political change. Constitutions change for the worse because people forget their experience of earlier attempts of some to dominate others, or rather, because the people who overthrow bad regimes are unable to pass on this experience with sufficient clarity to their children as the children’s position in society becomes increasingly secure. Without real fear of domination (which mostly comes from actual experience of such attempts), egalitarian norms do not survive, a point that applies as much to the newly victorious Rome of Polybius’ time as to other polities. (Incidentally, this seems to indicate that the historian’s role is to remind his audience of these misfortunes, a point argued at some length by Balot with many examples from the rest of the Histories). Thus we have a dialectic between the tendencies to resent domination (which sustain egalitarian norms) and the tendencies to dominate (which corrupt these norms): as one gains the upper hand, it immediately begins to weaken. This dialectic is also a process of corruption: healthy norms are first destroyed among a small elite, then among a larger elite, and finally among the entire people as the historical memory of domination is lost first among the heirs of the monarch, later among the heirs of the larger elite that overthrew the tyrant, and finally among the people themselves through the corrupting effects of the competitive struggle for position among rich individuals. A secure, healthy simple regime is in a sense bad for the education of its leaders, whereas a certain kind of misfortune is a good education, a theme that Polybius emphasizes throughout the Histories.

Ultimately, of course, this “model” of political change is used by Polybius to understand and analyze Roman history: Rome was successful insofar as its leaders instinctively chose courses of action that constantly prevented them from giving full rein to their dominating tendencies (e.g., the “checks and balances” of the Roman mixed constitution, which has, I think, been much misunderstood by modern historians who point out, rightly, that Rome during Polybius’ lifetime was basically an oligarchy; but that is another topic) and will be unsuccessful insofar as it achieves full security (as is evident from the later books of Polybius’ Histories, or at least of what remains of them). The model may be historically implausible (in its assertion that typically tyrannies turn into aristocracies, and oligarchies into democracies, for example) but it is no more implausible than some of the rational choice models of political change in use today (which are useful too, I should note), and it has the added benefit of incorporating a plausible moral psychology. By contrast, Aristotle’s exhaustive description of political change in book V of the Politics, though empirically better informed and starting from a basically plausible principle about how the violation of norms about justice leads to political change (where justice is always understood as a form of equality, though differently in different regimes), seems to miss the forest for the trees. Aristotle spends too much time looking at purely accidental causes of political change (“exogenous shocks” in the contemporary economic jargon, such as foreign conquest or institutional drift), or exploring varieties of a single cause of political change (the attempts to dominate others by high-status individuals), whereas Polybius’ model almost begs to be formalized as a story about the interaction between tendencies to domination and tendencies to resent such domination in the absence of perfect memory about the consequences of domination, and it seems readily applicable to a variety of cases even when it cannot explain them completely. From this point of view, it does not surprise me that Polybius’ simplified story was much more influential, historically, than Aristotle’s complex and empirically informed catalogue of the causes of political change: it identifies a key cause of political change for ill, and suggests ready remedies (basically, keeping the fear of domination alive through “checks and balances,” a remedy that is mentioned by Aristotle as well, but only among many other suggestions, some major, some minor).