“…Our 13-year study of the Datini archives in Prato allow to find a lot of things undescribed before. In Datini's archives alone we were able to find the early "Profit on Merchandise" account (1392), Trial Balances and the Statement for sending to the headquarters (1393) (Kuter, 2017), early examples of asset impairment and depreciation (1392-1399) (Kuter, 2018a), the formation and use of a profit reserve (Kuter, 2019a), adjusting entries (Kuter, 2019b), cash accounting (Aleinikov, 2018b), early accounting of insurance transactions (Kuter, 2019c). There is no doubt that further studies of the archives of Datini, both by the authors of this research into primary sources of medieval accounting books.…”