The Long Tail
Why unlimited shelf space moves demand into the tail
Summary
Anderson, then editor of Wired, argues that removing the physical constraints of shelf space and distribution changes the shape of demand. A physical retailer stocks only items that sell well enough to justify their space, which truncates the demand curve. An online retailer with warehouse or digital distribution can carry unlimited inventory, and the aggregate sales of many low-volume items can equal or exceed the sales of the hits.
His evidence comes from Amazon, Netflix in its DVD period, Rhapsody, iTunes and eBay, with data showing that a substantial share of sales came from titles unavailable in physical stores. He identifies three forces that produce the effect: democratised production, which lets more people create; democratised distribution, which lets them reach buyers; and connected supply and demand through search, recommendations and reviews, which he argues is the decisive one because unlimited inventory is worthless without filters that let people find what they want.
The strategic implications he draws include pricing lower where marginal cost is near zero, offering everything rather than curating, and letting the market do the filtering rather than predicting demand in advance.
The empirical claims have been substantially challenged. Anita Elberse's research found that demand has concentrated further rather than dispersing, that the tail has lengthened but become flatter, and that hits have become more dominant in music and video. Streaming economics since publication have concentrated attention on a small number of titles more than physical retail did. The observation about unlimited inventory and search-driven discovery is correct. The prediction that this would shift the balance of revenue away from hits has not held.
Key takeaways 8
- Physical shelf space truncates demand by excluding items that do not sell enough to justify their space, which distorts what appears to be consumer preference.
- Unlimited inventory plus effective search allows aggregate sales from many low-volume items to become commercially significant.
- Filters including search, recommendations and reviews are the decisive component, since unlimited inventory without them produces nothing.
- Production and distribution have both been democratised, which increases the number of available items faster than demand for any of them.
- Where marginal cost approaches zero, offering everything beats curating, because the cost of carrying an item that never sells is negligible.
- Predicting which items will sell becomes unnecessary when everything can be carried and the market can do the filtering.
- Subsequent research found that demand has concentrated further on hits rather than dispersing, which contradicts the book's central prediction.
- The tail has become longer and flatter, meaning more items sell almost nothing rather than the tail capturing more revenue.
Who should read it
Founders and investors in marketplaces and content businesses who want the original argument alongside the evidence that has since contradicted its main prediction.
About Chris Anderson
Former editor-in-chief of Wired and founder of 3D Robotics; wrote The Long Tail, Free and Makers.
The Long Tail set out how cheap distribution and good search move demand away from a few hits toward a very large catalogue of niche titles, and Free traced what happens to pricing when marginal cost falls to near zero. Both arguments sit underneath how operators and investors size demand in aggregator, marketplace and freemium businesses.
Where it sits in the reference 4
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