Plutonomy

New term for me here, not quite the same as a plutocracy.

Plutonomy -

Economic growth that is powered and consumed by the wealthiest upper class of society. Plutonomy refers to a society where the majority of the wealth is controlled by an ever-shrinking minority; as such, the economic growth of that society becomes dependent on the fortunes of that same wealthy minority. source

Democratic Underground: Citigroup's Shocking 'Plutonomy' Reports