This way lies charlatanism and worse. To act on the belief that we possess the knowledge and the power which enable us to shape the processes of society entirely to our liking, knowledge which in fact we do not possess, is likely to make us do much harm.
But in the social field the erroneous belief that the exercise of some power would have beneficial consequences is likely to lead to a new power to coerce other men being conferred on some authority. Even if such power is not in itself bad, its exercise is likely to impede the functioning of those spontaneous ordering forces by which, without understanding them, man is in fact so largely assisted in the pursuit of his aims.
- F.A. Hayek, from the essay The Pretense of Knowledge
We flatter ourselves undeservedly if we represent human civilization as entirely the product of conscious reason or as the product of human design, or when we assume that it is necessarily in our power deliberately to re-create or to maintain what we have built without knowing what we are doing. Though our civilization is the result of a cumulation of individual knowledge, it is not by the explicit or conscious combination of all this knowledge in any individual brain, but by its embodiment in symbols which we use without understanding them, in habits and institutions, tools and concepts, that man in society is constantly able to profit from a body of knowledge neither he nor any other man completely possesses. Many of the greatest things that man has achieved are the result not of consciously directed thought, and still less the product of a deliberately coordinated effort of many individuals, but of a process in which the individual plays a part which he can never fully understand. They are greater than any individual precisely because they result from the combination of knowledge more extensive than a single mind can master. -
F.A. Hayek from pages 149-150 of the 1979 Liberty Fund edition of Hayek’s 1952 study, The Counter-Revolution of Science
Hayek made the point outlined in the quotations above on many occasions and in many ways. Associated, but not exactly the same, Milton Friedman wrote a book and did a ten-part PBS series entitled Free to Choose. The point being made by Hayek and Friedman is that in the aggregate, in the real world, in the real time world where a zillion decisions are made daily.....it's mainly a spontaneous order phenomena [the plans of the many in an environment of free choice] that brings greatest satisfaction, value, wealth, etc. to the greatest number of people.
A confusion that reins supreme surrounds the idea of "planning". Yes, you can make dinner plans, plan the family's evening meal for the evening or even the evening meals for the entire week, you can make wedding plans, plan production, make shopping plans....you can plan your brains out...BUT those plans are, in fact, the plans of the many and are in fact the zillion decisions mentioned above.
Some want to transpose the concept "plan" or "planning" as a second coming of the concept "plan". That is to say, a plan exists ahead of the already conjured up plan -or- as a second coordinating factor ahead of those plans, that are in fact, the plans of the many and are in fact the zillion decisions mentioned above. Somehow a value exists in a second plan, the-plan-of-the-plans, a plan not of emergent order, rather a plan of mass coordination. Stated alternatively, the concept that if the conjured up plans yield value, then certainly the-plan-of-the-plans adds more value.
If you think about it, to plan the zillion plans is to undo the zillion plans in some shape or fashion to meet the supposed super coordinated plan which is the-plan-of-the-plans. Greatest satisfaction of all is now reduced to a third party satisfaction. The third party being the few that authored the-plan-of-the-plans.
Moreover, the zillion decisions resulting in a zillion plans are made in real-time, with real information based on current conditions of alternatives. Any super coordinated plan, the plan-of-the-plans, would be after the fact based on post information and post conditions of alternatives. Further the knowledge of the many making the zillion decisions/plans would be supplanted by the few. The few, no matter how smart, knowledgeable or expert, have less total knowledge than the total knowledge of the many.
Hayek and Friedman's observations are counterintuitive: that planning has a limit.
Occasionally history records the coming of politico-ideologist they believe they can plan the zillion plans, that in essence, planning has no limit, and they have the-plan-of-the-plans . They merely plan to restrict, with their monumental plan-of-the-plans, the spontaneous order phenomena that brings greatest satisfaction, value, wealth...you name it...to the greatest number of people.
The result? The plan-of-the-plans is abysmal.

If one is concerned with equality, then one should also be very, very concerned with equality of power.
Would the power to create equality require inequality of power? Equality is achieved via inequality? Would it be that those with a zest for equality fail to see the inequality of means to achieve such equality? -Or- are those with a zest for equality, in essence, merely transposing inequalities?
“The two visions entail very different views of the relationship between members of the existing society. The unconstrained vision has tended historically toward creating more equalized economic and social conditions in society, even if the means chosen imply great inequality in the right to decide such issues and choose such means. Clearly, only very unequal intellectual and moral standing could justify having equality imposed, whether the people want it or not, as Dworkin suggests, and only very unequal power would make it possible. It is consistent for the unconstrained vision to promote equalitarian ends by unequalitarian means, given the great difference between those whom Mill called “wisest and best” and those that have not yet reached that intellectual and moral level.
Conversely, those with the constrained vision have tended to be less concerned with promoting economic and social equality, but more concerned with the dangers of an inequality of power, producing and articulate ruling elite of rationalists. In Hayek’s words:
The most dangerous state in the growth of civilization may well be that in which man has come to regard all these beliefs as superstitions and refuses to accept or to submit to anything which he does not rationally understand. The rationalist whose reason is not sufficient to teach him those limitations of the power of conscious reason, and who despises all the institutions and customs which have not been consciously designed, would thus become the destroyer of the civilization built upon them.” (1) (2)
Which then leads to this observation :
“This way lies charlatanism and worse. To act on the belief that we possess the knowledge and the power which enable us to shape the processes of society entirely to our liking, knowledge which in fact we do not possess, is likely to make us do much harm.
But in the social field the erroneous belief that the exercise of some power would have beneficial consequences is likely to lead to a new power to coerce other men being conferred on some authority. Even if such power is not in itself bad, its exercise is likely to impede the functioning of those spontaneous ordering forces by which, without understanding them, man is in fact so largely assisted in the pursuit of his aims.” - F.A. Hayek, from the essay The Pretense of Knowledge
Which lends itself to this observation:
[Paraphrasing] In a consciously planned economy equality of income becomes an income redistribution scheme. Once the centrally planned economy fails, the justification for the continuation of the centrally planned economy becomes equality of income. -Thomas Sowell
Notes:
(1) Thomas Sowell, A Conflict of Visions: Ideological Origins of Political Struggles, 2007 edition, page 55.
(2) F.A. Hayek, The Counter-Revolution of Science: Studies on the Abuses of Reason, 1979, pp, 162-163