The firm that best fits Eq. (3) is a mature single-product company. The ideal company would constantly purchase inputs, transform them into final products, and sell them, with a constant operating margin and predictable deadlines for suppliers and consumers. Here, there are no cash holdings in Operation working capital because we assume a production process that is stable over time, as shown in Fig. 1.Variations in Operation working capital come from changes in the Cash conversion cycle or increased sales and a combined effect that occurs only if both variables change simultaneously (assuming daily revenue *365 as annual revenue):