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Voltaire is pointing out that the wealthy rely on the existence of poorer classes of people in order to maintain their comfortable lifestyle. If there were no poor, there would be no one to perform low-paying jobs that support the rich, such as servants, manual laborers, etc.
So Voltaire is arguing that the rich benefit from and depend on having a large population of poor people who are able and willing to work for low wages. In other words, inequality between the rich and poor is what allows the rich to live so comfortably according to Voltaire.