Gramsci’s concept of historical regularity derives from Ricardo’s political economy, not natural science.

Evidence

How did the founder of the philosophy of praxis arrive at the concept of regularity and necessity in historical development? I do not think that it can be thought of as a derivation from natural science but rather as an elaboration of concepts born on the terrain of political economy, particularly in the form and with the methodology that economic science acquired from David Ricardo. Concept and fact of determined market: i.e. the scientific discovery that specific decisive and permanent forces have risen historically and that the operation of these forces presents itself with a certain “automatism” which allows a measure of “predictability” and certainty for the future of those individual initiatives which accept these forces after having discerned and scientifically established their nature. “Determined market” is therefore equivalent to “determined relation of social forces in a determined structure of the productive apparatus”, this relationship being guaranteed (that is, rendered permanent) by a determined political, moral and juridical superstructure. — Antonio Gramsci, Selections from the Prison Notebooks, 1459

Categorization

• DEFINE: Defines ‘determined market’ as the equivalent of a determined relation of social forces rendered permanent by a superstructure.
• XREF: The superstructure-guarantees-structure claim loops back to the base/superstructure scaffolding in Gramsci’s earlier notebooks; also connects forward to how ideology naturalizes economic relations.