Thus neither the provision of signposts on the roads nor, in most circumstances, that of the roads themselves can be paid for by every individual user. Nor can certain harmful effects of deforestation, of some methods of farming, or of the smoke and noise of factories be confined to the owner of the property in question or to those who are willing to submit to the damage for an agreed compensation. In such instances we must find some substitute for the regulation by the price mechanism. But the fact that we have to resort to the substitution of direct regulation by authority where the
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