Greetings, Comrade!
I would also like to offer a slight clarification: not "oligarchs," but the bourgeoisie; not "workers," but the proletariat. That is, if we are following Lenin.
Do not forget that, under a capitalist system, the proletariat consists not only of workers and peasants but also of the intelligentsia—doctors, teachers, researchers, engineers, and the like.
The middle class, too, is for the most part part of the proletariat.
The bourgeoisie, meanwhile, enriches itself through "surplus value." Were it not for this surplus value, then—firstly—all goods would be twice a scheaper, and—secondly—all global financial institutions would be abolished as unnecessary.