However, by the spring of 1845 his continued study of political economy, capital and capitalism had led Marx to the belief that the new political economic theory that he was espousing – scientific socialism – needed to be built on the base of a thoroughly developed materialistic view of the world.
Namun, pada musim semi 1845, kajian lanjutan ekonomi politik, kapital dan kapitalisme buatannya membuat Marx meyakini bahwa teori ekonomi politik baru yang ia soroti (sosialisme saintifik) perlu dibangun atas dasar pandangan materialistis yang sedang berkembang di dunia.