I never cease to be amazed by Americans. The former Obama administration operative & current head man in your Windy City, Rahm Emanuel, is championing buses that sell healthy food in what are called food desserts. If I am not mistaken, a similar effort was tried in New York with a much smaller mode of transport-food carts- selling food in front of those dreadful corner "grocery" stores. The healthy food cart owners were beset upon by unhappy store owners and dared not return. Read about this healthy and clever development in an article from the Huffington Post.