It is of course a bit cliché: One cannot sell what one does not own. The offline retailer who still hands his products across the counter simply stops selling the moment he runs out. For the online retailer, however, the situation is much more challenging. There is often a city, a country or even a continent between the warehouse and the virtual shop counter.
This is currently one of the greatest challenges in the e-commerce sector. But keeping track of product inventory pays off. (Length: 1,600 words; 7 minutes)