Menander Rhetor, 1.16. How to Praise Cities…
“There are three kinds of governments: monarchy, aristocracy, and democracy. There is bad form which corresponds to each: Tyranny is the worse form of monarchy; oligarchy and also plutocracy are the bad form of aristocracy; and mob rule is the worse kind of democracy. In addition to these, sometimes there is one with elements from all of them, like the Roman Empire or ancient Sparta….
“Where offices are occupied by those who fulfill what is needed by the law, then he considered the state to be an aristocracy. Where they were filled by those who had the most money, a plutocracy; where everyone could serve, a democracy.”
Πολιτεῖαι μέν εἰσι τρεῖς, βασιλεία, ἀριστοκρατία, δημοκρατία, ταύταις δὲ παρακείμεναί εἰσι κακίαι, βασιλείᾳ μὲν τυραννίς, ἀριστοκρατίᾳ δὲ ὀλιγαρχία καὶ πλουτοκρατία λεγομένη, δημοκρατίᾳ δὲ λαοκρατία. παρὰ πάσας δὲ ταύτας ἡ μικτὴ ἐκ πάντων τούτων, ὁποία ἥ τε Ῥωμαϊκὴ καὶ ἡ Λακωνικὴ τὸ παλαιόν.
καὶ ὅπου μὲν ἐκ τῶν τὰ νόμιμα ἐπιτελούντων αἱ ἀρχαὶ καθίστανται, ταύτην μὲν τὴν πολιτείαν ἀριστοκρατίαν ἐνόμιζεν εἶναι, ὅπου δ’ ἐκ τιμημάτων, πλουτοκρατίαν, ὅπου δ’ ἐκ πάντων, δημοκρατίαν.
“if the state is a plutocracy, [praise it] as if it were really an aristocracy”
εἰ δὲ πλουτοκρατουμένην, ὡς ἀριστοκρατουμένην εἰ δὲ πλουτοκρατουμένην, ὡς ἀριστοκρατουμένην·
Xenophon, Memorabilia 4.16.12 (Full text on the Scaife Viewer)
“[Socrates] believed that kingship and tyranny were both governments but that they differed from one another. For he believed that kingship was government of a willing people and according to the laws of the city, while tyranny was when people were unwilling and against the laws, but instead according to the wishes of the ruler. Whenever leaders were selected from those who meet the standards of the law, the government is in aristocracy. When they are chosen from those who have enough property, it is a plutocracy. When they are elected from everyone, it is a democracy.”
Βασιλείαν δὲ καὶ τυραννίδα ἀρχὰς μὲν ἀμφοτέρας ἡγεῖτο εἶναι, διαφέρειν δὲ ἀλλήλων ἐνόμιζε. τὴν μὲν γὰρ ἑκόντων τε τῶν ἀνθρώπων καὶ κατὰ νόμους τῶν πόλεων ἀρχὴν βασιλείαν ἡγεῖτο, τὴν δὲ ἀκόντων τε καὶ μὴ κατὰ νόμους, ἀλλ᾿ ὅπως ὁ ἄρχων βούλοιτο, τυραννίδα. καὶ ὅπου μὲν ἐκ τῶν τὰ νόμιμα ἐπιτελούντων αἱ ἀρχαὶ καθίστανται, ταύτην μὲν τὴν πολιτείαν ἀριστοκρατίαν ἐνόμιζεν εἶναι, ὅπου δ᾿ ἐκ τιμημάτων, πλουτοκρατίαν, ὅπου δ᾿ ἐκ πάντων, δημοκρατίαν.
Aristotle, Politics 2.7 (1273a-1273b)
“If election based on wealth is oligarchic while election according to excellence is aristocratic, there can be a third system according to which a state is organized as the Carthaginian polity is constructed. For they choose their leaders looking at two issues, especially the most significant offices, that of kings and generals.
But it is right to think that this departure from aristocracy is an error by the lawmaker. For among the most critical issues to consider from the beginning is how the best citizens might be able to have the free time and to refrain from anything inappropriate, both in office and in their private life. If it is right to consider furnishing the means for free time [to rule], it is bad for the most significant positions to be for sale (the kingship and the generalship).
For this law makes wealth more important than virtue and makes the whole state structured around money. Whatever the power structure considers valuable, the opinion of the rest of the citizens will follow. Wherever virtue is not honored above all else, the constitution cannot be aristocratic. It is also likely that those who purchase their offices will make a profit from them when they rule after spending their own money. For, it would be strange if a respectable man who is poor will want to profit but a corrupt man who has spent his own money would be disinclined to do the same.”
εἴπερ οὖν τὸ μὲν αἱρεῖσθαι πλουτίνδην ὀλιγαρχικὸν τὸ δὲ κατ᾿ ἀρετὴν ἀριστοκρατικόν, αὕτη τις ἂν εἴη τάξις τρίτη καθ᾿ ἥνπερ συντέτακται καὶ τοῖς Καρχηδονίοις τὰ περὶ τὴν πολιτείαν· αἱροῦνται γὰρ εἰς δύο ταῦτα βλέποντες, καὶ μάλιστα τὰς μεγίστας, τούς τε βασιλεῖς καὶ τοὺς στρατηγούς. δεῖ δὲ νομίζειν ἁμάρτημα νομοθέτου6 τὴν παρέκβασιν εἶναι τῆς ἀριστοκρατίας ταύτην· ἐξ ἀρχῆς γὰρ τοῦθ᾿ ὁρᾶν ἐστὶ τῶν ἀναγκαιοτάτων, ὅπως οἱ βέλτιστοι δύνωνται σχολάζειν καὶ μηδὲν ἀσχημονεῖν, μὴ μόνον ἄρχοντες ἀλλὰ μηδ᾿ ἰδιωτεύοντες. εἰ δὲ δεῖ βλέπειν καὶ πρὸς εὐπορίαν χάριν σχολῆς, φαῦλον τὸ τὰς μεγίστας ὠνητὰς εἶναι τῶν ἀρχῶν, τήν τε βασιλείαν καὶ τὴν στρατηγίαν. ἔντιμον γὰρ ὁ νόμος οὗτος ποιεῖ τὸν πλοῦτον μᾶλλον τῆς ἀρετῆς καὶ τὴν πόλιν ὅλην φιλοχρήματον· ὅ τι δ᾿ ἂν ὑπολάβῃ τίμιον εἶναι τὸ κύριον, ἀνάγκη καὶ τὴν τῶν ἄλλων πολιτῶν δόξαν ἀκολουθεῖν τούτοις· ὅπου δὲ μὴ μάλιστα ἀρετὴ τιμᾶται, ταύτην οὐχ οἷόν τ᾿ εἶναι βεβαίως ἀριστοκρατικὴν πολιτείαν. ἐθίζεσθαι δ᾿ εὔλογον κερδαίνειν τοὺς ὠνουμένους, ὅταν δαπανήσαντες ἄρχωσιν· ἄτοπον γὰρ εἰ πένης μὲν ὢν ἐπιεικὴς δὲ βουλήσεται κερδαίνειν, φαυλότερος δ᾿ ὢν οὐ βουλήσεται δαπανήσας.
From the Oxford English dictionary
πλουθυγίεια: “wealth and health”
πλούταξ: “a rich churl”
πλούταρχος: “master of riches”
πλουτογαθής: “delighting in riches”
πλουτοκρατέομαι: “to live in a state governed by the rich”
πλουτοκρατία: “an oligarchy of wealth
πλουτοτραφής: “raised on wealth”
πλουτόχθων: “rich in things of the earth”
Polybius, Histories 6.4
“The proof that what I have said is true comes from the following. It must not be asserted that every well-made government is a principality, but only the government which is assented to voluntarily and which is governed by reason rather than fear and force. Nor should we consider every oligarchy to be an aristocracy: the latter emerges only when men rule because they are the most just and the most prudent. In a similar way, a true democracy is not that in which the majority has the power to do whatever it wants, but what counts is if the will of the majority enforces observance of its traditional laws, honor to the customary laws, duty to parents, respect to elders, obedience to the laws—then it is right to call a state a democracy.
From this, we can isolate six types of government: the three I have just mentioned and three additional, related forms, monarchy, oligarchy, and mob rule. The first of these, monarchy, arises naturally, and without machination. The second follows it and develops from it with preparation and adjustment. Once this has transformed into the evil form akin to it, tyranny, and aristocracy develops from the dissolution of both. When aristocracy devolves into oligarchy as is natural, and the people turn into rage over the injustice of their leaders, democracy emerges. Over time, mob-rule develops from outrage and illegality. Anyone can understand clearly from this pattern that the things I am saying now are true, based on the nature of each government in its origins and its evolution.”
ὅτι δ᾽ ἀληθές ἐστι τὸ λεγόμενον ἐκ τούτων συμφανές.  οὔτε γὰρ πᾶσαν δήπου μοναρχίαν εὐθέως βασιλείαν ῥητέον, ἀλλὰ μόνην τὴν ἐξ ἑκόντων συγχωρουμένην καὶ τῇ γνώμῃ τὸ πλεῖον ἢ φόβῳ καὶ βίᾳ κυβερνωμένην:  οὐδὲ μὴν πᾶσαν ὀλιγαρχίαν ἀριστοκρατίαν νομιστέον, ἀλλὰ ταύτην, ἥτις ἂν κατ᾽ ἐκλογὴν ὑπὸ τῶν δικαιοτάτων καὶ φρονιμωτάτων ἀνδρῶν βραβεύηται.  παραπλησίως οὐδὲ δημοκρατίαν, ἐν ᾗ πᾶν πλῆθος κύριόν ἐστι ποιεῖν ὅ,  τι ποτ᾽ ἂν αὐτὸ βουληθῇ καὶ πρόθηται παρὰ δ᾽ ᾧ πάτριόν ἐστι καὶ σύνηθες θεοὺς σέβεσθαι, γονεῖς θεραπεύειν, πρεσβυτέρους αἰδεῖσθαι, νόμοις πείθεσθαι, παρὰ τοῖς τοιούτοις συστήμασιν ὅταν τὸ τοῖς πλείοσι δόξαν νικᾷ, τοῦτο καλεῖν δεῖ δημοκρατίαν. διὸ καὶ γένη μὲν ἓξ εἶναι ῥητέον πολιτειῶν,  τρία μὲν ἃ πάντες θρυλοῦσι καὶ νῦν προείρηται, τρία δὲ τὰ τούτοις συμφυῆ, λέγω δὲ μοναρχίαν, ὀλιγαρχίαν, ὀχλοκρατίαν.  πρώτη μὲν οὖν ἀκατασκεύως καὶ φυσικῶς συνίσταται μοναρχία, ταύτῃ δ᾽ ἕπεται καὶ ἐκ ταύτης γεννᾶται μετὰ κατασκευῆς καὶ διορθώσεως βασιλεία.  μεταβαλλούσης δὲ ταύτης εἰς τὰ συμφυῆ κακά, λέγω δ᾽ εἰς τυραννίδ᾽, αὖθις ἐκ τῆς τούτων καταλύσεως ἀριστοκρατία φύεται.  καὶ μὴν ταύτης εἰς ὀλιγαρχίαν ἐκτραπείσης κατὰ φύσιν, τοῦ δὲ πλήθους ὀργῇ μετελθόντος τὰς τῶν προεστώτων ἀδικίας, γεννᾶται δῆμος.  ἐκ δὲ τῆς τούτου πάλιν ὕβρεως καὶ παρανομίας ἀποπληροῦται σὺν χρόνοις ὀχλοκρατία.  γνοίη δ᾽ ἄν τις σαφέστατα περὶ τούτων ὡς ἀληθῶς ἐστιν οἷα δὴ νῦν εἶπον, ἐπὶ τὰς ἑκάστων κατὰ φύσιν ἀρχὰς καὶ γενέσεις καὶ μεταβολὰς ἐπιστήσας.