Answer: It is Bundling type of sales promotion.
Step-by-step explanation:
Bundling is a type of sales promotion where combination of products are sold for same price. Here the shoes and socks are sold for the price of the shoes. Bundling offers are generally seen in the retail stores for various products. Bundling offers also increases the sales of shoes in the store. When the products are of high quality and worthy of the price customers will tend to buy products during the promotions.
It is also an effective way of selling more products at reasonable prices. The quantity of sales will double during bundling offer of the shoe store.