This paper investigates how the presence of social learning affects the the introduction strategy of a product line with a forward-looking consumer population, within a simple two-period model. So in this paper has been considered a firm that offers two new vertically differentiated products to consumers. consumers may choose to strategically delay their purchasing decisions in anticipation of the product reviews of their peers. It is assumed that the quality of the products is unknown to the consumers and products have both experience attributes and search attributes. So the early consumers make the purchasing decision based on search attributes and their prior belief about the quality of products. These consumers learn the true quality and reveal this information to the successive consumers through a social learning process. Two alternative employed:(i) preannounced pricing and (ii) responsive pricing.
