A workforce that is highly skilled can generally claim a higher income. The explanation is simple : a higher productivity of added value associated with a relative scarcity of highly-qualified professionals translates into a fierce competition for their talent and pay more important. The low-skilled workers being more numerous and less capable of producing value-added are limited to salaries of more modest. However, an earlier study by the French economist Philippe Aghion nuance this explanation of the pay gap between working…

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