In today's economy, retailers are hard pressed to increase revenues. Among the biggest challenges they face is... matching supply with demand. In The New Science of Retailing: How Analytics Are Transforming the Supply Chain and Improving Performance, Wharton professor Marshall Fisher and co-author Ananth Raman argue that retailers have the data they need to manage supply chains more efficiently and increase sales and profits. Knowledge@Wharton spoke with Fisher about what types of data are most important for retailers to collect, how they can use this information to identify home-run products and why the retailing industry might be missing as much as one-third of potential sales.