This piece of god-fearing, pious righteousness comes from the second edition of 1901, after all that had been written by Engels, Kautsky and Mehring to destroy this learned legend, and in spite of it. Quite inevitably, of course, and proof against any evidence to the contrary, however weighty, it was only right in the eyes of all the learned German economists that the palm of 'priority' should be wrested from Marx, the revolutionary anarchist, by Rodbertus, the 'socialist' with monarchist, Prussian and nationalist leanings, the man who believed in communism five hundred years from now, but for the present supported a steady exploitation rate of 200 per cent. However, we are interested in another aspect of Rodbertus' analysis. The same Professor Diehl continues his eulogy as follows: 'Rodbertus was not only a pioneer of socialism; political economy as a whole owes much stimulation and furtherance to him; economic theory in particular is indebted to him for the critique of classical economics, for the new theory of the distribution of income, for the distinction between the logical and historical categories of capital, and so on.' Here we shall deal with these latter achievements of Rodbertus, especially with the 'and so on'. Rodbertus' decisive treatise, _Towards the Understanding of Our Politico-Economic Conditions_[232] of 1842, set the ball rolling. v. Kirchmann replied in _Demokratische Blätter_ with two essays--_On the Social Aspects of Ground Rent_[233] and _The Society of Barter_[234]--and Rodbertus parried in 1850 with his _Letters on Social Problems_.[235] Thus the discussion entered the same theoretical arena where Malthus-Sismondi and Say-Ricardo-MacCulloch had fought out their differences thirty years earlier. In his earliest writings, Rodbertus had already expressed the thought that the wages of labour present an ever diminishing part of the national product in modern society where the productivity of labour is increasing. He claimed this to be an original idea, and from that moment until his death thirty years later he did nothing but reiterate it and formulate it in various ways. This 'declining wage rate' is for him the root of all evils to be found in modern society, in particular of pauperism and the crises, whose combination he calls 'the social problem of our times'.