plutonomy

Etymology
From. Google’s n-gram search suggests the Plutonomy was coined in late 1800s. References to the term using n-gram can be found in books as early as 1851, in a book written by John Malcolm Forbes Ludlow titled “Christian Socialism and Its opponents”, where it was used in the context of wealth.

In modern use popularized by Ajay Kapur in a series of papers published during his tenure as Citigroup’s global strategist.

Noun

 * 1)  The study of the production and distribution of wealth, or a society seen as dominated by such concerns.