The factor affecting the working capital requirements of this industry is the availability of raw materials. The unavailability of a specific raw material leads to a lag in the production process, impacting the company's ability to meet production schedules and fulfill orders. This necessitates holding larger inventories of raw materials to buffer against supply disruptions, thus increasing working capital needs. While the efficiency of converting raw materials into finished goods is a relevant operational factor, the primary driver of increased working capital in this scenario is the unreliable supply of a key raw material.