The energy sector has been the main economic hub in everyone’s lives and in world geopolitics. Consequently, oil, gas, electricity and energy from renewable sources (wind and solar) are traded on the stock market, and all interconnected around the world. On the other hand, a global health crisis, such as COVID-19, can produce a great economic catastrophe. In this scenario, a robust statistical analysis will be performed here with respect to the concept of interdependence and contagion effect. For this project, we chose to study the relationship between the main source of energy (crude oil, WTI and Brent) and two (Gold and Silver) precious metals (which are a safe haven for investment). Therefore, with the novelty of the application of ${\rho }_{DCCA}$ and $\Delta {\rho }_{DCCA}$ coefficients before and during the COVID-19 crisis (announced by the World Health Organization), the interdependence and the contagion effect were calculated. We verified that COVID-19 had no influence on contagion effect between crude oil in its indexes, WTI and Brent, since they have already shown to be highly interdependent, both before and after the World Health Organization COVID-19 decree. Likewise, COVID-19 had a significant influence on the crude oil and precious metal sectors, which was evident as we identified an increase in its interdependence, with a clearly positive contagion. These results show that COVID-19 imposed a restructuring in the relationship between energy (crude oil) and precious metals. More details will be presented throughout this article.

Research background: The global interdependence of financial markets due to globalization has resulted in standardized trading conditions for agricultural commodities, reducing the advantages of portfolio diversification. Recent events between 2020 and 2023 underscore the growing importance of real-time information for investors to make informed decisions in this interconnected financial landscape. Purpose of the article: This article aims to conduct a bibliometric review of the literature about market interdependence. We investigate the contagion effect on agricultural commodities and identify commodities and methods used in the most cited publications from 1997 to 2022. Methods: A bibliometric analysis was developed, for this, the SCOPUS database was used, sorting with Rayyan, Excel, and finally, the Bibliometrix/R-project to extract bibliometric information from the database. Findings & value added: The analysis highlights the prominent role of certain countries in contributing to scientific research on this topic, with China and the United States being leaders, collectively producing 24.57% of all publications in the examined periods. The research underscores the global concern for sustainable development, emphasizing the scientific growth linked to this topic and its intersection with energy sources. Unlike other bibliometric studies, this research consolidates relevant methodologies employed in analyzing interdependence and contagion effects in agricultural commodities over the past decades. Additionally, it identifies the most studied commodities in these works. As the world grapples with the challenges of market interdependence, particularly in the wake of recent events between 2020 and 2023, this study underscores the importance of real-time information for informed decision-making. The study suggests a shift towards cleaner and renewable energy sources in the coming years, anticipating increased investments in research and development.

O texto discute o desenvolvimento de uma oficina direcionada ao público da Educação Jovens e Adulto (EJA) em uma escola pública em Feira de Santana, Bahia que teve como objetivo investigar as potencialidades e limitações no desenvolvimento do raciocínio lógico e interpretação da realidade fazendo uso dos jogos grafos no contexto de uma experiência didática. A oficina abordou, elementarmente, conceitos iniciais e intuitivos sobre a Teoria dos Grafos, que são apresentados neste trabalho, desde o seu contexto histórico até algumas aplicações. O desenvolvimento dessa oficina teve ênfase nos jogos, explorando a relação destes com grafos e o caráter dinâmico e educativo que há na sua utilização.

As commodities de boi gordo, milho e soja tem sido as protagonistas no setor agropecuário na Bahia, dado a quantidade de mercados produtores e o volume comercializado. Neste trabalho propomos estudar

Objective: This article aims to analyze the connectivity of the fat ox and corn price indices in Bahia Theoretical Framework: The State of Bahia is economically and internationally important in terms of agricultural production in Brazil. Therefore, studying economic indicators and understanding their dynamics is necessary in increasingly competitive markets. Method: To this end, the daily price indices in the main regions of the State of Bahia will be investigated using network analysis weighted by the coefficient of , the formation of clusters, and degree distribution. Results and Discussion: Strong connectivity in the fat ox networks was found for all time scales and for corn only for large scales. The results allowed the unification of the fat ox market to be identified and the trend for price indices to move. Meanwhile, the corn market only has these characteristics for large scales, allowing for better short-term business opportunities. Research Implications: This research provides valuable information for developing public policies, local and international investors, researchers, and those interested in the subject. In addition, it can serve as a bridge to understanding the socioeconomic and environmental effects on the commodities market.

The purpose of this article is to conduct a bibliometric review of literary production in terms of market interdependence. We investigate the effect of contagion on agricultural commodities and identify the commodities and methods used in the most cited publications over the decades. For this, we used the SCOPUS database, sorting with Rayyan, Excel, and finally, the Bibliometrix/R-project. The results showed that corn, wheat, soybeans, cotton, and sugar are the most studied commodities. There is no uniqueness concerning the methods used to identify interdependence and the contagion effect. Also, it is possible to perceive the growing scientific interest concerning the subject, with a diversity of authors and magazines. However, there is a direction of the and magazines most cited articles for analyzing agricultural commodities and energy, demonstrated a worldwide trend of studies relating natural resources, biofuels, clean energy, and efficiency. In addition, countries like China and the United States stand out in this scientific scenario as the countries that produce the most articles.