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Those who reject the public interest and other theories about collective interests, usually, argue about the danger of violating personal freedoms. For them strengthening and development of private interests is a precondition for liberty. This article criticizes
this point of view and speaks about the necessity of having a theory about public interest. In this context, two related propositions have been discussed. Firstly, public interest theory, essentially, is not in contradiction with individual's freedom and
does not break his or her status in society. Of course, some extremist theorists of interest do that; but these are exceptional. In spite of this, it is possible to formulate a concrete theory on public interest that in which individual freedom have been observe9. Secondly, the author believes that a developed
conception of liberty closely relates to common interest.