The article analyses the hallmarks of the concept of economic activity contained in the Entrepreneurs’ Law Act. The research perspective included the determination of the systemic consequences related to the positive qualification of activity as economic activity. In this respect, both the Polish legal system as well as the law in the supranational dimension were taken into account. It was assumed that the definition contained in the Entrepreneurs’ Law Act is adequate for the entire legal system, with the exceptions expressly provided by the legislator. This results from the universal character of the term in question, which with its content properly serves the purpose of achieving the constitutionally guaranteed freedom of economic activity.