This excerpt taken from the LTD 10-K filed Mar 28, 2008.
Results of Operations
Summary of 2007
Our operating results are generally impacted by changes in the overall U.S. economy and, therefore, we monitor the retail environment using, among other things, certain key industry performance indicators such as the University of Michigan Consumer Sentiment Index (which measures consumers views on the future course of the U.S. economy), the National Retail Traffic Index (which measures traffic levels in approximately 1,500 malls nationwide) and National Retail Sales (which reflects sales volumes of 5,000 businesses as measured by the U.S. Census Bureau). These indices provide insight into consumer spending patterns and shopping behavior in the current retail environment and assist us in assessing our performance as well as the potential impact of industry trends on our future operating results. Additionally, we evaluate a number of key performance indicators including comparable store sales, gross profit, operating income and other performance metrics such as sales per average selling square foot and inventory per selling square foot in assessing our performance.