The model presented here derives the product life cycle of durable goods. It is based on the idea that the purchase process consists of first purchase and repurchase. First purchase is determined by the market penetration process (diffusion process), while repurchase is the sum of replacement...

We model a market for news where profit maximizing media outlets choose their editors from a population of rational citizens. We show that when information acquisition is costly, liberal (conservative) citizens find optimal to acquire information from a media outlet having a liberal...