Developing sustainable competitive advantages is important for retailers. Some key advantages include customer loyalty programs to track purchasing habits, strategic location of stores near one another to promote the brand with little advertising, efficient distribution and information systems to lower costs and stock popular items, exclusive private label brands only available at that retailer, strong vendor relationships for supply and merchandise, excellent customer service that is difficult for competitors to match, and leveraging multiple competitive advantages simultaneously like McDonald's does with food quality, speed, cleanliness, and value.