The H Street Wal-Mart in Washington, D.C. Ten years ago, none of the city's 600,000 residents lived within 1 mile of a Wal-Mart. Today, almost 13 percent do. Emily Jan/NPR hide caption

itoggle caption Emily Jan/NPR

A puppy waits at an adoption event in Miami last year. The city is now considering a ban on the sale of puppies in retail pet stores. Cities and towns in several states have passed similar bans, aimed at cracking down on substandard, large-scale puppy breeders. Wilfredo Lee/AP hide caption

itoggle caption Wilfredo Lee/AP

Customers walk out of Street Boutique, parked in Shirlington Village, Va. Street Boutique is a pop-up truck that's similar to the many food trucks in the area, except it sells clothes and jewelry. James Clark/NPR hide caption

itoggle caption James Clark/NPR