Note 606 — Chapter IV · : FRIEDRICH LIST AND THE NATIONAL SYSTEM OF POLITICAL ECONOMY

“Of all the things required for the purposes of man, the one that least bears transportation, and is, yet, of all the most important, is manure. The soil can continue to produce on the condition, only, of restoring to it the elements of which its crop had been composed. That being complied with, the supply of food increases, and men are enabled to come nearer together and combine their efforts—developing their individual faculties, and thus increasing their wealth; and yet this condition of improvement, essential as it is, has been overlooked by all economists.” (Principles of Social Science, vol. i, pp. 273-274.)