Yes, stock shortages affect sales. When a product is out of stock, consumers cannot buy the product they need, which may cause them to choose other brands or give up the purchase. This will lead to a drop in sales and may damage the brand's reputation. In addition, stock shortages may also lead to inventory backlogs and losses. Therefore, in order to maintain stable sales and customer satisfaction, supply chain management and inventory control are very important to ensure sufficient supply of products.