plutocracy
US /pluːˈtɑː.krə.si/
UK /pluːˈtɑː.krə.si/

1.
government by the wealthy
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The nation was slowly transforming into a plutocracy, where money dictated policy.
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Critics argue that the current system is a disguised plutocracy.
2.
a country or society governed by the wealthy
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Many fear that the nation is becoming a true plutocracy, ignoring the needs of the poor.
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The novel depicted a dystopian future where the world was run by a global plutocracy.