Ideas don't create matter, matter creates ideas. The human being is special because it recreates matter which recreates ideas in an endless spiral. Capitalism wasn't invented but arose especially once industrialization took off with the steam engine. Organization of society really started with agriculture, feudalism with the ability to store the gains from agriculture, Capitalism with factories aided by steam engines and machinery, and Socialism has already cropped up around the world with the rise of mass industry and international Imperialism.

The human mind exists in the context of its environement. We don't really consciously employ a system as it was designed, rather, the system emerges due to physical laws of development of technology and new capabilities, and humans can do their best to tweak or guide that process. Socialism is a critical step because under Capitalism, profit is the prime motivator and that works against a common goal, while in Socialism humanity has understood the laws of social development and can make Capital work towarda a common, cooperative goal.

Socialism: Utopian and Scientific is a great and far more thorough overview of what I just described, a brief overview of Historical and Dialectical Materialism.