From Chapter 3 of Law, Legislation, and Liberty:
“From the insight that the benefits of civilization rest on the use of more knowledge than can be used in any deliberately concerted effort, it follows that it is not in our power to build a desirable society by simply putting together the particular elements that by themselves appear desirable. Although probably all beneficial improvement must be piecemeal, if the separate steps are not guided by a body of coherent principles, the outcome is likely to be a suppression of individual freedom.
The reason for this is very simple, although not generally understood. Since the value of freedom rests on the opportunities it provides for unforeseen and unpredictable actions, we will rarely know what we lose through a particular restriction of freedom. Any such restriction, any coercion other than the enforcement of general rules, will aim at the achievement of some foreseeable particular result, but what is prevented by it will usually not be known. The direct effects of any interference with the market order will be near and clearly visible in most cases, while the more indirect and remote effects will mostly be unknown and will therefore be disregarded. We shall never be aware of all the costs of achieving particular results by such interference.
And so, when we decide each issue solely on what appear to be its individual merits, we always over-estimate the advantages of central direction. Our choice will regularly appear to be one between a certain known and tangible gain and the mere probability of the prevention of some unknown beneficial action by unknown persons.
