Why might the wealthy people in a poor country support an oligarchy when fqced with communist revolution in their country?

Because they benefit from it

Oligarchy refers to a system of government where the most control in the government is held by a small group of government officials. In poor country,  The wealthy would most likely have a close relationship with such oligarch. They usually provide the oligarch with some sort of reward in return for legislation made by the oligarch to help their businesses.

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