Most of us HOPEFULLY don't think of buying at Walmart as buying local, just because it's the local Walmart. But even these big chain stores are jumping on the bandwagon. Check out this article on the meaning of local: Dirty Tricks On Localwashing
"The city did agree to remove from its press materials and Web site a reference to a study that found that, for every $100 spent locally, $45 stays in the community. The problem was that, according to the study, conducted by the firm Civic Economics, the figure was accurate only if the money was spent at a locally owned business. Shop at a chain store, the analysis found, and only $13 of that $100 spent stays in the community."