Walmarts can be found all across the U.S., but you won’t find a single store in the five boroughs of New York City. Five years ago, the company was thwarted in its attempts to get a foothold in the biggest city in America. Now the company is back with new ideas on how to win in the Big Apple. For example, on the drawing board is a smaller Super Center format that’s just80,000 square feet and does not include categories such as lawn and garden centers. Another idea is a 3,500-s...