Government by the wealthy is known as plutocracy.
Plutocracy is a form of government in which wealthy individuals or a wealthy class have the most political power and influence. In a plutocratic system, the wealthy have disproportionate control over political decision-making, which can result in policies that favor the rich and powerful while ignoring the needs and interests of the majority.
Plutocracy can also lead to economic inequality, as policies are put in place that benefit the wealthy and maintain their power and influence over time. This can exacerbate social and economic divisions and create a system that favors the privileged few at the expense of the rest of society.
In summary, plutocracy is a form of government in which wealthy individuals or classes hold the most power and influence, potentially leading to policies that benefit the rich and exacerbate social and economic inequality.