Medieval economics and economy ethics were closely interconnected. Ethical issues inspired scholastic masters to conduct economic analysis. These issues were present in two types of scholastic texts: 1) in theological treatises and summas as the part of practical theology; 2) in commentaries to Aristotelian moral philosophy, especially to 'Nicomachean ethics', 'Politics', and 'Economics'. The main sources of medieval economic ethics were: the Bible with patristic theology, canon law (influenced by civil law), and Aristotelian moral philosophy. These sources are symbolized by the two images. The 'Nicomachean ethics' presents the image of a merchant who throws out his goods during the storm, which symbolizes economic compulsion. The Gospel shows the image of Jesus Christ driving out merchants from the Jerusalem Temple which was considered in discussions about merchant ethics. In the field of economic ethics medieval authors primarily dealt with key issues of property, just price and usury. Late medieval appreciation artisan's labour and merchant's enterprise (industria) as sources of wealth rejected Aristotelian static paradigm, in which wealth was obtained primarily from nature and economic exchange was a game with zero result.