A matching model will explain both unemployment and economic growth by considering the underground sector and human capital. Three problems can thus be simultaneously accounted for: (i) the persistence of the underground sector, (ii) the ambiguous relationships between underground employment and...

In this article, we propose a value creation model based on the principle of the chain of value in corporate management. We particularly endeavor to show the incidence of a relevant allowance of a company's resources on its profitability, by distinguishing on one hand the activities that are...