Amazon can offer preferential prices to customers by setting preferential policies for bulk purchases. Specifically, Amazon can set different discounts based on the quantity purchased by customers, such as a 5% discount for purchases of more than 10 items, a 10% discount for purchases of more than 20 items, and so on. At the same time, Amazon can also consider providing free or preferential shipping services to customers who buy in bulk, so as to attract customers to make bulk purchases. This can not only motivate customers to buy more goods, but also increase sales and customer satisfaction.