Because It Apparently Has To Be Said Again
For now, just a long blockquote from the late Ernest Mandel, Trotskyite economist extrordinaire, from his Introduction to the Vintage Edition of Capital, Volume I, 1976.
[Capital] was never intended as a handbook to help governments to solve such problems as balance-of-payment deficits, nor yet as a learned, if somewhat trite, explanation of all the exciting happenings in the market place when Mr. Smith finds no buyer for his last 1000 tons of iron. It was intended as an explanation of what would happen to labour, machinery, technology, the size of enterprises, the social structure of the population, the discontinuity of economic growth, and the relations between workers and work, as the capitalist mode of production unfolded in all its terrifying potential. From that point of view the achievement is truly impressive. It is precisely because of Marx's capacity to discover the long-term laws of motion of the capitalist mode of production in its essence, irrespective of thousands of "impurities" and of secondary aspects, that his long-term predictions--the laws of accumulation of capital, stepped-up technological progress, accelerated increase in the productivity and intensity of labour, growing concentration and centralization of capital, transformation of the great majority of economically active people into sellers of labour-power, declining rate of profit, increased rate of surplus-value, periodically recurrent recessions, inevitable class struggle between Capital and Labour, increasing revolutionary attempts to overthrow capitalism--have been so strikingly confirmed by history.This judgement has generally been challenged on two grounds. The easiest way out for critics of Marx is simply to deny that the laws of motion of the capitalist mode of production which he discovered have been verified at all. This is generally done by reducing them to a couple of misstated and oversimplifed formulae (see below): "progressive immiseration of the working class" and "ever-worsening economic crisis." A more sophisticated objection was advanced by Karl Popper, who denied the very possibility, or rather the scientific nature, of such "laws," calling them "unconditional historical prophecies" to be clearly distinguished from "scientific predictions." "Ordinary predictions in science," says Popper, "are conditional. They assert that certain changes (say, of the temperature of water in a kettle) will be accompanied by other changes (say, the boiling of the water)." Popper denies the scientific nature of Capital by asserting that, unlike scientific theories, its hypotheses cannot be scientifically tested.
This is obviously based upon a misunderstanding of the very nature of the materialist dialectic, which, as Lenin pointed out, requires constant verification through praxis to increase its cognition content. In fact, it would be very easy to "prove" Marx's analysis to have been wrong, if experience had shown, for example, that the more capitalist industry develops the smaller and smaller the average factory becomes, the less it depends upon new technology, the more its capital is supplied by the workers themselves, the more workers become owners of their factories, the less the part of wages taken by consumer goods becomes (and the greater the becomes the part of wages used for buying the workers' own means of production). If, in addition, there had been decades without economic fluctuations and a full-scale disappearance of trade unions and employers' associations (all flowing from the disappearance of contradictions between Capital and Labour, inasmuch as workers increasingly become the controllers of their own means and conditions of production) then one could indeed say that Capital was so much rubbish and had dismally failed to predict what would happen in the real capitalist world a century after its publication. It is sufficient to compare the real history of the period since 1867 on the one hand with what Marx predicted it would be, and on the other with any such alternative "laws of motion," to understand how remarkable indeed was Marx's theoretical achievement and how strongly it stands up against the test of history.
Pages 23-25