When it comes to the notoriously competitive retail sector, every dollar counts. That's why investors may want to take a look at stocks like Deckers Outdoor DECK -0.72% , O'Reilly Automotive , and Lululemon Athletica LULU -1.46% Those three stocks boast the sector's highest return on invested capital, according to a note from Citi Research on Friday. The note also applauded Ross Stores and TJX Companies TJX -0.81% among discount retailers. Return on invested capital, or ROIC, is a measure of how much operat ...