Based on the work of Jean Fourastié, accountant and economist, this paper seeks to show that the origins of double-entry bookkeeping are the result of several successive innovations that appeared in Italian commercial enterprises between the 13 th and 14 th centuries in response to the development of credit and receivables. The three successful innovations that led to the invention of double-entry bookkeeping are thus analyzed in detail from an accounting and logical point of view. This invention, which will have considerable consequences for the emergence of our modern monetary and banking systems, leads to a precise and efficient definition of value, which we still depend on today, especially to understand financial crises.