Signals vs. Noise (37 Signals): 5 business lessons from Costco

http://www.37signals.com/svn/posts/505-5-business-lessons-from-costco
"How Costco Became the Anti-Wal-Mart explores the interesting formula for success that CEO Jim Sinegal has implemented at the nation’s fifth-largest retailer: Sell a limited number of items, keep costs down, rely on high volume, pay workers well, have customers buy memberships and aim for upscale shoppers, especially small-business owners. In addition, don’t advertise – that saves 2 percent a year in costs."