File photo of Costco store in Arvada

 
File photo of Costco store in Arvada
A Costco store is seen in Arvada, Colorado, in this March 4, 2009 file photo. Costco Wholesale Corp, Starbucks and Whole Foods Market are joining forces to propose alternatives to a bill that makes it easier for workers to unionize but is strongly opposed by U.S. corporations. The three retail giants said on March 21, 2009 they sought a "third way" as big business and labor unions face off over the Employee Free Choice Act, backed by President Barack Obama. REUTERS/Rick Wilking/ Files (UNITED STATES BUSINESS)