Sektor budownictwa i handlu w działalności przedsiębiorców w metropoliach w zachodniej Polsce

The article discusses the case of building construction and trade as an example of economic activities in the western metropolies of Poland. Development of economic activities is seen as the catalyst in metropolitan growth. An example of such a study is the analysis of building construction and trade in Poznań, Wrocław and Szczecin. The article contains information on Regional Management. The number of construction-businessmen and trade-businessmen in these metropolies was compared with the number of all businessmen in these metropolies, and with the number of construction-businessmen and trade-businessmen in metropolitan regions.