Economics is a science because it makes falsifiable predictions and tests them against data. Marxism is built on “inevitabilities”: capitalism will collapse, workers will revolt in rich countries, the state will wither away into communism, etc. None of these claims are falsifiable. If there is no evidence that can change your mind, it’s not science.
Marx positions that history is contingent upon class struggle, and highlights that capitalism’s own internal contradictions will bring about its collapse, to which they have at numerous points throughout capitalism’s brief history. nowhere does Marx convey that socialism or communism is inevitable out of capitalism’s collapses, and history reaffirms this. it takes a conscious and organized class struggle in order for socialism to develop out of capitalism
the simple fact, hitherto concealed by an overgrowth of ideology, that mankind must first of all eat, drink, have shelter and clothing, before it can pursue politics, science, art, religion, etc.; that therefore the production of the immediate material means, and consequently the degree of economic development attained by a given people or during a given epoch, form the foundation upon which the state institutions,