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The impact of biological invasions should be considered from ecological and economic perspective. To understand the influence of the invader, both its range and abundance should be known. Even if the range of invaders is well-known, the problem of assessing their abundance still occurs very often. In this study we report the results of an assessment of the area covered by stands of alien Solidago species in Silesia (Central Europe, south-western Poland, area ca. 30 000 km²), and estimated costs of the invaded areas recultivation. The results of field survey show that the stands of invasive Solidago species cover an area of about 130 000 hectares in S-W Poland, which is ca. 4.5% of the total area of the studied region. It was also found that the cadastral data and Corine land cover maps underestimate the area of fallowed agricultural lands. The cost of removing stands of invasive Solidago species in S-W Poland ranges from 123.24 to 266.17 million PLN, depending on the method. The method that balances reasonable costs, low environmental impact and efficiency of grassland establishment costs 180.7 million PLN for S-W Poland.
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Subject and purpose of work: The article describes a new subject of research into the history of economic thought, the international Pribuzhie region. The article discusses the history of the rise and development of economic science in the Pribuzhie region from the 8th to the 21st century, which is the subject of research. The aim of the article is to present a new perspective on the subject of research as well as the characteristics of the process of economic science in the Pribuzhie region. Materials and methods: The article uses a conventional method, which is a collection of historical, hilosophical and economic methods of cognition, on the basis of which, in the context of a scientific program, the past of economic thought and relevant doctrines are examined, and their content is described. Results: The various historical stages in the development of the economic thought of the Pribuzhie region are described, as well as new, unpublished facts relating to individual economic doctrines. Conclusions: Political activity and public administration activities should involve economic education, which defines the essence of economic policy, its objectives and ways of realization in the practical sphere.
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