1, advantages: a, increase sales: large customers often have higher purchases, which is helpful to improve the sales performance of enterprises. B, saving sales cost: through the sales model of big customers, enterprises can concentrate on developing and maintaining a few big customers, thus reducing sales cost. C. Establishing long-term cooperative relationship: Establishing long-term cooperative relationship with major customers will help enterprises to stabilize sales channels and reduce market risks. D, improve brand awareness: through the key account sales model, the products of enterprises can enter more market channels, thus improving brand awareness and influence.

2. Disadvantages: A. Dependence on big customers: The sales model of big customers may lead enterprises to rely too much on a few big customers. Once a big customer changes, it may have a greater impact on the enterprise. B, fierce competition: large customers often become the targets of many competitors, and enterprises need to pay more efforts and resources to maintain and expand the large customer market. C. Decline in profit rate: In order to win large customers, enterprises may need to lower product prices or provide preferential conditions, which will lead to a decline in profit rate. D. Customer concentration risk: The sales model of big customers may lead to higher customer concentration of enterprises. Once a key customer has credit risk or operational difficulties, it may cause a greater risk of accounts receivable to the enterprise.