Sismondi influenced many major socialist thinkers including Karl Marx, Rosa Luxemburg, and Robert Owen. Marx thought Sismondi embodied the critique of the "bourgeois science of economics." In his notes, Marx excerpted various aspects of his analysis. Marx was particularly fond of Sismondi's statement that "The Roman proletariat lived almost exclusively at the expense of society. One could almost say that modern society lives at the expense of the proletariat, from the share which it deducts from the reward of his labor." Henryk Grossman argued that Sismondi was a significant methodological and theoretical predecessor of Marx, particularly by identifying the contradiction between use-value and exchange-value as fundamental to capitalism. In 1897,Vladimir Lenin wrote an article refuting Sismondi's work. Lenin said,"