Chris Anderson ends chapter 8 of his stimulating The Long Tale, with a provocative jab at economists:
(p. 146) Finally, it’s worth noting that economics, for all its charms, doesn’t have the answer to everything. Many phenomena are simply left to other disciplines, from psychology to physics, or left without an academic theory at all. Abundance, like growth itself, is a force that is changing our world in ways that we experience every day, whether we have an equation to describe it or not.
The reference to Anderson’s book, is:
Anderson, Chris. The Long Tail. New York: Hyperion, 2006.