In connection with the above it must be noted that Ricardo commits all these blunders, because he attempts to carry through his identification of the rate of surplus-value with the rate of profit by means of forced abstractions. The vulgar mob has therefore concluded that theoretical truths are abstractions which are at variance with reality, instead of seeing, on the contrary, that Ricardo does not carry true abstract thinking far enough and is therefore driven into false abstraction. 
SOURCE: Marx, Karl. Theories of Surplus Value (1861; Chapter XVI: Ricardo’s Theory of Profit: 2b. [b) Ricardo’s Mistakes Regarding the Influence of Colonial Trade, and Foreign Trade in General, on the Rate of Profit].
Every beginning is difficult, holds in all sciences. To understand the first chapter, especially the section that contains the analysis of commodities, will, therefore, present the greatest difficulty. That which concerns more especially the analysis of the substance of value and the magnitude of value, I have, as much as it was possible, popularised.  The value-form, whose fully developed shape is the money-form, is very elementary and simple. Nevertheless, the human mind has for more than 2,000 years sought in vain to get to the bottom of it all, whilst on the other hand, to the successful analysis of much more composite and complex forms, there has been at least an approximation. Why? Because the body, as an organic whole, is more easy of study than are the cells of that body. In the analysis of economic forms, moreover, neither microscopes nor chemical reagents are of use. The force of abstraction must replace both. But in bourgeois society, the commodity-form of the product of labour — or value-form of the commodity — is the economic cell-form. To the superficial observer, the analysis of these forms seems to turn upon minutiae. It does in fact deal with minutiae, but they are of the same order as those dealt with in microscopic anatomy.
With the exception of the section on value-form, therefore, this volume cannot stand accused on the score of difficulty. I presuppose, of course, a reader who is willing to learn something new and therefore to think for himself.
The physicist either observes physical phenomena where they occur in their most typical form and most free from disturbing influence, or, wherever possible, he makes experiments under conditions that assure the occurrence of the phenomenon in its normality. In this work I have to examine the capitalist mode of production, and the conditions of production and exchange corresponding to that mode. Up to the present time, their classic ground is England. That is the reason why England is used as the chief illustration in the development of my theoretical ideas. If, however, the German reader shrugs his shoulders at the condition of the English industrial and agricultural labourers, or in optimist fashion comforts himself with the thought that in Germany things are not nearly so bad; I must plainly tell him, “De te fabula narratur!” [It is of you that the story is told. – Horace]
Intrinsically, it is not a question of the higher or lower degree of development of the social antagonisms that result from the natural laws of capitalist production. It is a question of these laws themselves, of these tendencies working with iron necessity towards inevitable results. The country that is more developed industrially only shows, to the less developed, the image of its own future.
SOURCE: Marx, Karl. Capital, Volume I, Preface to the First German Edition (London, July 25, 1867), translated by Samuel Moore and Edward Aveling, edited by Frederick Engels (1887).
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