Seven is considered a magic number. We traditionally have had seven seas and seven wonders of the world and seven deadly sins. Some gamblers consider seven a lucky number; Christianity teaches that even God Himself rested on the seventh day. And many sports leagues â baseball, basketball and hockey among them â play a best-of-seven series to determine their champions. And that is what brings us here today. For the past seven years, we have indulged ourselves in an experiment: Whenever thereâs a major sports championship, we examine the two cities represented to see if there are any economic lessons there that we can apply here in Southwest and Southside Virginia.