Table 2.

Notations description.

Notations	Definitions
R	The e-retailer
P	The e-commerce platform
c	Cost per unit of product
p	Price per unit of product
D	Consumer demand
α	Amount of discounts for the e-retailer
β	Amount of discounts for the e-commerce platform
e	Promotion effort factor of the e-commerce platform
f	Commission factor
λ	Promotional effort cost-sharing ratio factor
π iR	The profit of the e-retailer. i denotes the number of models
π iP	The profit of the e-commerce platform