EN
This article is dedicated to the presentation of agricultural accounting theory, developed in Poland by the nineteenth-century thinker, professional and social activist Juliusz Au. He created a coherent and timeless theory of accounting, by means of the three cognitive levels:1) the general level – including the concept, objectives and methods of accounting,2) the procedural level – which defines the rules of assets measurement, the selec-tion of the reporting period and cost calculation,2103) the supporting level – including the organization of accounting, guidelines for the collection of statistical data and auditing.Definition of market price (fair) presented by Juliusz Au carries the essential features of the fair value concept, characteristic of modern accounting. He was an uncompromising advocate of this value as the basis for the valuation of agricultur-al assets.