The structure of a national economy is generally correlated with the stage of economic development. In economic history, it was demonstrated a trend from a first stage when agriculture predominated to last stage when the sector of services is the largest. In this context, the complex...

The study focused on the early stage of Romania’s transition to the market economy during 1990-1992, based on statistical data available at that time. Because of the inherited structural distortions, the persistence of strong forces of inertia and the incoherence of economic and monetary...

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 study concentrated on demonstrating how non-linear modelling can be useful to investigate the behavioural of dynamic economic systems. Using some adequate non-linear models could be a good way to find more refined solutions to actually unsolved problems or ambiguities in economics. Beginning...

Coming from standard economic growth theory and empirical evidences, we concentrated on the convergence process as a result of structural changes in economy. We investigate the differences among countries in EU in terms of the share in total economy of main sectors. Then, based on the spatial...

The interest rate and investment are among the central variables influencing the growth rate. Due to the complexity empirically demonstrated of the interest rate – investment – GDP growth relationship, last decades a growing concern over the modelling this relationship has increased...

The actual global crisis seems to influence negatively the sustainable development in EU countries. At least partially the informal economy escapes from the official registered GDP and hidden migration from the official demographic statistics. This can affect in a significant way the measurement...

Starting from existing literature and recent years studies, several modeling schemes have been developed, which may prove useful to substantiate strategies aimed at achieving a demographic and economic balance between generations. This way, we can obtain simulations from a country or group of...

To estimate long-run growth based on the so-called potential GDP became a constant preoccupation among economists. However, one remaining problem in every long-run growth model is to estimate a persistent trend in labour productivity outside of it, in order to avoid the implicit circular...

Many problems emerge since it is widely believed that high tax rates and ineffective tax collection by government are the main causes contributing to the rise of the informal economy. Already the economists have established a relationship between tax rates and tax evasion or size of the informal...