The largest retailer in the world is again looking at entering the biggest city in the country. Wal-Mart executives figure that conditions are favorable for the company to come to New York. People are now looking for a bargain more than ever, and real estate prices here might not get a whole lot lower.The company has considered coming to New York in the past. Either way, it should expect a big fight from local labor unions, "You're not going to get into this city unless you come forward and talk to the players, and in New York City, like it or not, the labor movement is a major player," one union leader told Crain's.We wonder how much of a threat Wal-Mart poses to workers than the other big box chains in the city, such as Target, Bed Bath & Beyond and Costco.