The article examines the concept of “truly realized abstraction” in the reflection of Marx on “the scientifically correct method”, on distinction between “simple categories” and “concrete categories”, and on “reproduction”. The author tries to draw attention about “Finelli’s Marxism of abstraction” as a type of “humanism”. He reads the ‘Marxism of abstraction ’ through the analysis (shared by the author of the paper) of "financial capitalism", that today damages labour, industry and personal property.