If there existed the universal mind, that projected itself into the scientific fancy of Laplace; a mind that would register simultaneously all the processes of nature and of society, that could measure the dynamics of their motion, that could forecast the results of their inter-reactions, such a mind, of course, could a priori draw up a faultless and an exhaustive economic plan, beginning with a number of hectares of wheat and down to the last button for a vest. In truth, the bureaucracy often conceives that just such a mind is at its disposal; that is why it so easily frees itself from the control of the market and of Soviet democracy.
The innumerable living participants of economy, State as well as private, collective as well as individual, must give notice of their needs and of their relative strength not only through the statistical determinations of plan commissions but by the direct pressure of supply and demand. The plan is checked and to a considerable measure, realized through the market. The regulation of the market itself must depend upon the tendencies that are brought out through its medium. The blueprints produced by the offices must demonstrate their economic expediency through commercial calculation.
– Trotsky