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Through this paper we aimed to develop a comparison between ARIMA, Prophet, KNN and Neural Networks in terms of stock prices forecasting. After reviewing the literature, we noticed that there is a plethora of studies that address this problem of forecasting, but very few have made comparisons that include ARIMA, machine learning, but also the Prophet forecasting model developed by Facebook, which brought interesting results for certain data series. Based on methodologies validated by other authors, we compared these models in our paper and we sought to obtain promising results regarding performance evaluation. The comparison was made in-sample, the training period being 01/01/2010 - 31/07/2021, but also out-of-sample (01/08/2021 - 31/10/2021). The study was performed for Societe Generale’s stock, using daily observations. Statistical loss functions such as RMSE, MPE, MAPE, MAE, and ME were used for comparison. The results indicated an outperformance of Neural Networks, both in-sample and out-of-sample, this model being on the 1st place according to the aggregated score. It is also noteworthy that the ARIMA model was in second place in-sample, ahead of KNN, but for out of sample these two algorithms changed their positions. On the other hand, the Prophet algorithm performed the weakest, both in-sample and out of sample. Also, we must underlie that all four algorithms had a clear tendency to overestimate the price of Societe Generale, according to the results of the statistical loss functions ME and MPE. Finally, it should be noted that the results were consistent with what other authors found out, especially for the out-of-sample period, where the machine learning models performed best.

The purpose of this article is to study the contagion and the integration regarding the capital markets in Central and Eastern Europe (Romania, Hungary, Poland and Czech Republic). We will analyze the dynamics of correlation between these markets and the Eurozone over time. The methodology will be consisted of classical methods such as rolling-window Pearson correlation or more complex methods based on the correlation obtained using DCC-GARCH. At the same time, the results will be interpreted in the context of a diversified portfolio and will take into account the specificity of these markets and the phase of the economic cycle. The results revealed that the integration of the capital markets with the Eurozone markets has increased over time and the correlations were stronger. At the same time, increased integration has led to more pronounced contagion during the 2008 economic crisis.

In this article, we are assessing how prepared is the Romanian labour market so far in the context of joining the Euro Area, by proposing as tool the labour market flexibility (LMF) meant by its definition, to absorb the economic imbalances. Among the determinants of the LMF considered in our analyse are the demo-economic structures, the employment rate, the unemployment rate, the wage flexibility, the working time and employment period, the geographic mobility, etc. The analytical approach is structured on studying the distinct features of the Romanian labour market compared to the other EU Member States in general and those in the Euro Area in particular that can induce different responses to the various adjustment levers in Romania, compared to the other states. The results our research highlight that there still are gaps between Romania and the other EU28 Member States, and therefore, reducing these gaps requires the promotion of measures / programs to stimulate investment in technology, as well as measures to protect the redundant workforce resulting from these investments and, implicitly, specific strategies and the ability to support the costs attached to them. Since Romania is no longer competitive in terms of the availability of adequate workforce, this in a wider context of the new challenges faced by the Romanian economy, with potential significant impact on labour demand architecture (digitization, industry 4.0, environmental compliance and sustainable development requirements, energy paradigm changes, etc.), which support the need to estimate the demand for labour and its quantitative and structural-qualitative characteristics, as well as strategies adopted by the state and companies to provide the necessary labour force. Therefore, a responsible wage setting policy is needed to ensure that overall wage dynamics are attuned to productivity developments and reflect prevailing conditions on the labour market, while the public administration and the private sector need to work closely together to improve the Romanian labour market before it becomes a major impediment to further economic development.

The research carried out on Romania's foreign trade performance aimed at establishing the impact of the Romania's accession to the EU onto the Romanian external trade balance. Another important scientific contribution is the analysis of the impact of the new Romanian trade policy on the general evolution of Romania's foreign trade during the period 1995-2016, for which we used a series of general indicators that we usually find in the statistical yearbooks , under the names of: export value (FOB prices); import value (CIF prices); value of imports (FOB prices); trade balance (FOB exports - CIF imports); trade balance (FOB exports - FOB imports); export per capita. In today's context, it is justified to identify innovative methods and strategies for establishing and capitalizing on the competitive advantages of Romanian companies engaged in foreign trade as a result of our country's accession to the European Union, in order to solve the complex economic problems generated by the major trade deficit of Romania, as well as the creation of mechanisms for implementing the strategies and methods resulting from the researchers conducted to reduce this deficit and to maximize the positive effects of Romania's accession to the EU. As this article shows, Romania's degree of international openness has been sinuous, with the year 2016 being the year when it reached the maximum value of the analyzed period of 83.71%. To this result, an important contribution was almost equal to exports and imports (around 42.32% of trade opening from imports and 41.39% of exports), which represents a significant improvement over the period 2000-2013. Also our analyse for Romania shows that excepting the years 1995-1996, 1998, 2000-2001 and 2003-2007, respectively, 2016, the coefficient of elasticity of imports was higher than the modulus of elasticity of exports, although subunit in the years 1997, 1999, 2005, 2007-2009 and 2013 respectively. Certainly, future research directions will mainly address and develop the same directions we have been dealing with so far, but deepening our research in several directions, such as: regulatory aspects of international trade by investigating the extensive ramifications of the tensions that exist in the relationship between the WTO and the regional trade agreements, which we consider to be of systemic significance, as they also place strong emphasis on Romanian foreign trade and commercial policy, Romania, as an EU member, being part of more than half of the world's functioning bilateral trade agreements; geographic reorientation of Romania's foreign trade by providing studies to Romanian business agents enabling them to maximize the opportunities offered by the rich portfolio of free trade agreements made available by the European Union on the basis of the products that make up current structure.

The empirical studies carried out on Romania's foreign trade performance aimed at establishing, on the one hand, the products with which Romania is competitive in the foreign markets and which are the external markets that the Romanian products are most competitive, so that the responsible factors the Romanian foreign trade can adopt the strategy of correct and scientifically based promotion at a macroeconomic level and on the other hand to indicate to the Romanian economic agents the directions they must orientate or reorient their exports in order to maximize the derived positive effects from the EU accession, taking advantage of the free trade agreements that we have also taken as partners from the moment of Romania's accession to the EU, agreements that create us access in advantageous conditions, of high competitiveness, on foreign markets with which Romania did not agree before the EU accession, and at the same time to encourage the export activity of the Romanian economic agents that produce products identified in the researches carried out in this study, as having a high competitive potential for export on the markets concerned. In this context, we were concerned with the identification of innovative methods and strategies for establishing and capitalizing on the competitive advantages of Romanian companies with foreign trade activity as a result of our country's accession to the European Union, in order to solve the complex economic problems generated by the major trade deficit Romania, as well as the creation of mechanisms for implementing the strategies and methods resulting from the research conducted to reduce this deficit and to maximize the positive effects of Romania's accession to the EU. As it is well known, export competitiveness is a fertile ground for analyzing entrepreneurial potential and how it manifests itself, with entrepreneurial culture representing, together with other specialized factors of production, an important source of competitive advantage and one of the determinants of national competitive advantages. The analysis of the exchange ratio and coverage and specialization of the foreign trade for the whole period 1990-2016 was also carried out in order to highlight the evolution of Romania's foreign trade and the strategic role played by the European Union in this evolution. The present study presents only the analyses and their results for the period 2000-2016, considered eloquent for the European economic integration of Romania, taking into account the fact that in February 2000 the negotiations for the accession of our country to the EU started.