Soon afterwards it was drawn on by the author of Libro che tracta di mercatantie et usanze de' paesi, compiled in 1458 probably by Giorgio Chiarini, afterwards incorporated in Luca Pacioli's Summa de arithmetica.
Later on, the concept was depicted by the author of a book that deals with trade and customs of countries, compiled in 1458 likely by Giorgio Chiarini, and subsequently incorporated into Luca Pacioli's comprehensive treatise on arithmetic.