In these 26 theses presented at the Milan Meeting of the International Communist Party in 1952, Amadeo Bordiga sets forth his conception of the “invariance” of Marxism, utilizing colorful examples from the histories of religion, mythology, ideology and science as well as the class struggle, denouncing “modernizers” (he says they are worse than Stalinists) “weasel assumptions”, “foolish clichés”, “bourgeois prejudices”, “aberrations”, and “nonsense”, and everything that stands opposed to the “common doctrine of the party, uniform, monolithic, and invariable, to which we are all subordinated and bound, putting an end to all chattering and know-it-all discussions”.
The revolutionary program of communist society eliminates all forms of ownership of land, the instruments of production and the products of labor - Partito Comunista Internazionale
In this 1957 text drafted for the Partito Comunista Internazionale, Amadeo Bordiga, with his usual acerbic wit, restates some of the “invariant” principles of Marxism, denounces the idea that communism means collective or individual “property” or “ownership”—terms he subjects to historical analysis as transitory juridical forms—argues in favor of social usufruct as the concept most adequate for the future classless society, ridicules the “metaphysical and idealist” error of the “immediatists” who hold that “socialism is a struggle for the individual liberation of the worker” and, just to rub it in, condemns drinkers and smokers as “usufructuary traitors” against the health of the species.
Keynesian economics claimed to have overcome the problem of economic depressions. However, as Mattick argues that crises are inherent within capitalism and that neither the market nor Keynesianism can stop "the steady deterioration of the economy". Written in 1974, Economic Crisis and Crisis Theory is one of Mattick's most valuable contributions to the Marxist critique of political economy and radical theory in general.