ABSTRACT
This chapter presents a case study based on a merchant book of Johan Pyre (formerly known as Johan Pisz), a merchant active in Gdansk between 1421 and 1455. His merchant book contains valuable evidence on credit forms (such as cash credit, trade credit, credit in commodities, life annuities, and wedderlegynge), their usage and prevalence in the Hanseatic League sphere as well as their documentation and lack thereof in town books due to the inherently pragmatic literacy of merchants of that time and region.
