Translate the following English sentence to French:
"It is of the utmost importance to address the issue of those who cannot keep up, one which reminds us of how difficult and complicated it is to establish progress indicators and how inadequate it is to use the parameter of per capita income alone."
Le sujet des déshérités est important, il nous rappelle combien il est difficile et compliqué de créer les indicateurs du progrès pour lequel le seul paramètre du revenu par habitant est insuffisant.