The rule of a few—aristocracy. The rule of the wealthy—plutocracy. Where the few, being valued above the many, are determined principally on account of wealth, the two forms of government fuse into the aristocracy of the moneyed interest. The cardinal virtue is the fundamental desire for more—otherwise known as greed. Justice is limited to peerage, or amicitia (friendship) based on having wealth. This sort of justice, which can be derived from Cicero, is antithetical to justice as caritas seu benevolentia universalis (love, that is, universal benevolence), which comes from Plato, Augustine, and Leibniz.
The full essay is at "On the Aristocracy of Wealth."