What does "plutonomy" mean?

What does the word plutonomy mean?

here's one definition:

The science of wealth or riches.

or

The study of the production and distribution of wealth

and an example from Progressive Bloggers:

Including the disaster capitalists who, in Naomi Klein's book, thought that they could own the world and simply jet away from all natural disasters to some well-appointed, "plutonomy" - friendly desert island.

Here's an 1854 excerpt from the Christian Remembrancer Volumes 27-28 page 459:

Mr. Ludlow who is an uncompromising advocate of the rights of labor, observes: 'So longe, therefore, as your competitive plutonomy confines itself to its scientific field, to its dead subject-matter of wealth, we socialists have to listen to it and learn from it

There's also a good definition and infographic about plutonomy in pages 231-232 of George L. Fouke's Damn The Warocracy:

hope this helps! :)

It is a neologism suggesting an economy driven by or for the wealthiest (from the Greek ploutos meaning wealth).

This suggests it was invented by a Deutsche Bank analyst. This prefers Citigroup.