" The theory of the long tail as popularized by Chris Anderson in his book of the same name is that our culture and economy are increasingly shifting away from a focus on a relatively small number of major hits (mainstream products and markets) at the head of the demand curve and toward a huge number of niches in the tail. As the costs of production and distribution fall, especially online, there is now less need to lump products and consumers into one-size-fits-all containers. In an era without the constraints of physical shelf space and other bottlenecks of distribution, narrowly targeted goods and services can be as economically attractive as mainstream fare. 5 "