(Juglar cycles) having its origin in the initial diffusion process. The theory suggests that there exists two diffusion … comparison with empirical data suggests that the theory describes the main trend of the product life cycle superimposed by short …

describes the concurrent evolution of the unit sales and price of durable goods. The theory is based on the idea that the sales … market penetration. The theory suggests that the imitation rate B indicating social contagion in the Bass model has its …