The Product Life Cycle (PLC) concept is a well-known marketing strategy and planning tool. The concept is based on a simple biological analogy of stages over a product's "life," which is intuitively appealing, but unfortunately has limited utility in practice. For such a prominent marketing...

In many product categories of durable goods such as TV, PC, and DVD player, the largest component of sales is generated by consumers replacing existing units. Aggregate sales models proposed by diffusion of innovation researchers for the replacement component of sales have incorporated several...