Are sales (discounts) during a promotional period considered an investment by the company/manufacturer to drag in more customers? Or a loss that wouldn't be paid back anytime in the future, but also drags in customers? If its the former (i.e investment) how do they pay back the money that's being discounted?
e.g A product officially costs 100USD. There's a sale for that product for 50% off (so that product is now 50USD), how do they make profit or get back that other 50USD?