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This paper aims to identify selected behavioral effects in people caused by the coronavirus pandemic. The research problem was formulated as a question: has people's behavior changed after the announcement of restrictions related to the coronavirus pandemic in Poland?. An analysis of the literature, the results of the authors' own research, and participant observation confirmed the consistency of the results with the literature on behavioral economics. The results may be of cognitive importance in terms of backward induction, taking into account the behavior of the respondents. A selected description of actual behavior during the coronavirus situation is a novelty of the paper. The reader may become aware of differences in their own behavior and that of their family, colleagues, or others. They may also realize that we often react subconsciously and are guided by the suggestions of others. [ABSTRACT FROM AUTHOR]

A demonstration of the relationship between the share of renewables in gross marginal energy and selected countries' economic growth is the basis of this research. The paper seeks to investigate mutual correlations between renewable energy sources and economic growth for two EU economies and how it influences their fluctuations (increase and decrease). The comparative analysis of results was carried out for less-income Polish and high-income Swedish economies. This research used a regression model to answer the research questions examining the presence of correlations between renewable energy sources in gross marginal energy consumption and economic growth. This study analyzes data starting from 1991 to 2022. The results indicated a positive correlation (statistical significance) between Gross Domestic Product and Gross National Income variables for Sweden (84.6% and 83.7%, respectively) and Poland (79.9% and 79.2%, respectively), which influence the use of renewable energy sources. The findings also reveal that the higher economic growth caused by the use of renewables is observed for the leading countries but at the same time the risk of a greater recession is much more likely than in other countries. These findings would help government officials and policymakers to better understand the role of renewable energy in the economic growth of these countries. This study has contributed to the literature on renewable energy sources and statistical reports under the EU energy sector framework. [ABSTRACT FROM AUTHOR]