plutocracy noun
a system of government in which the richest people in a country rule or have power
It's time we put an end to plutocracy.

A plutocracy is a country where the richest people have power.
This country is supposed to be a democracy, but it seems to me as if it's becoming more of a plutocracy all the time.

The plutocracy is the richest people in a country who have power in it.
The area is a favourite winter vacation spot among the plutocracy.

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