ฉันต้องใช้ภาษาอังกฤษถูกหลักไวยากรณ์
Knowing demand for Product X means Knowing how much to order .
Sales quantity and sales revenues are maximized because there are no inventory shortages or lost sales .
Expenese are minimized because there is no unsold inventory.
Knowing which marketing promotion will get the highest response rete maximizes sales revenues while avoiding the huge expense of a useless promotion.