Translate the following English sentence to French:
"Where capitalism in its most unadulterated and depressing form and the unbridled market economy rule, there is a fine, indiscernible line between the scientific motives and speculative madness of the multinational pharmaceutical monopolies."
La ligne de démarcation entre les mobiles scientifiques et la spéculation acharnée, propre aux multinationales pharmaceutiques et aux monopoles, devient opaque et vacillante sous le régime du capitalisme le plus excessif et brutal assorti de l' implacable économie de marché.