translate English to French: They are often publicly provided in such plentiful measure that there is no need for rivalry among potential consumers.3 As brought to light by the previous chapter’s reexamination of the notion of publicness and analyzed in detail by Desai in his historical review of the concept of public goods and public provision, the properties of goods are variable and subject to change—over time and across regions, cultures, and population groups.
` La connaissance est aussi un exemple interessant pour illustrer la ques´ tion qui se trouve au centre des chapitres de Desai et de Kaul et Mendoza (dans le volume), a savoir la distinction a etablir entre les proprietes poten` ` ´ ´ ´ tielles d’un bien et ses proprietes effectives. Certaines formes de connais´ ´ sance, notamment celles dotees d’une valeur commerciale potentielle, ne ´ sont pas dans le domaine public et se voient conferer un caractere exclusif ´ ` au moyen d’instruments tels que les droits de propriete intellectuelle2.