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At Publisher's Weekly: One of the featured speakers at Friday’s BISG meeting was Anita Elberse, associate professor at Harvard Business School, who challenged some conclusions of Chris Anderson’s long tail theory. Elberse said that while the growth of online retailing has resulted in the expansion of products that are available for sale in the long tail, there is little evidence to show that sales of niche products have significantly increased. “The tail is getting longer, but it isn’t getting fatter,” Elberse asserted, referring to Anderson’s contention that with more items in the tail, sales will increase.