In this paper we classify competitive markets using a new form of normalized Herfindahl index and the degree of dominance of the leader. For this purpose we use the notion of copula, which connects two or more random variables with given marginals. The parameters of the two marginals (which are...

The challenges of sustainable development are well known: the full enjoyment of the earth's resources without compromising the welfare of future generations. It is to reconcile the three pillars on which the concept is based, namely: economic, social and environmental. Beyond that called...

Most of economic and financial time series have a nonstationary behavior. There are different types of nonstationary processes, such as those with stochastic trend and those with deterministic trend. In practice, it can be quite difficult to distinguish between the two processes. In this paper,...