These results are not due to mere chance. The adjustments we have tried out on Marx's diagram are merely meant to illustrate that technical progress, as he himself admits, must be accompanied by a relative growth of constant as against variable capital. Hence the necessity for a continuous revision of the ratio in which capitalised surplus value should be allotted to _c_ and _v_ respectively. In Marx's diagram, however, the capitalists are in no position to make these allocations at will, since the material form of their surplus value predetermines the forms of capitalisation. Since, according to Marx's assumption, all expansion of production proceeds exclusively by means of its own, capitalistically produced means of production and subsistence,--since there are here no other places and forms of production and equally no other consumers than the two departments with their capitalists and workers,--and since, on the other hand, the smooth working of the accumulative process depends on that circulation should wholly absorb the aggregate product of both departments, the technological shape of enlarged reproduction is in consequence strictly prescribed by the material form of the surplus product. In other words: according to Marx's diagram, the technical organisation of expanded production can and must be such as to make use of the aggregate surplus value produced in Departments I and II. In this connection we must bear in mind also that both departments can obtain their respective elements of production only by means of mutual exchange. Thus the allocation to constant or variable capital of the surplus value earmarked for capitalisation, as well as the allotment of the additional means of production and subsistence (for the workers) to Departments I and II is given in advance and determined by the relations between the two departments of the diagram--both in material and in terms of value. These relations themselves, however, reflect a quite determinate technical organisation of production. This implies that, on the assumptions of Marx's diagram, the techniques of production given in each case predetermine the techniques of the subsequent periods of enlarged reproduction, if accumulation continues. Assuming, that is to say, in accordance with Marx's diagram, that the expansion of capitalist production is always performed by means of the surplus value originally produced in form of capital, and further--or rather, conversely--that accumulation in one department is strictly dependent on accumulation in the other, then no change in the technical organisation of production can be possible in so far as the relation of _c_ to _v_ is concerned.