Visa

Visa (V) was recently recommended by Cabot. Visa just went public March 19, and has grown 26% in it's first month. As there is little investor data on Visa, to me it seems like a big unknown. However, I thought it was interesting that (while only for a month) it has follow, close to, the exact same price trend as master card, which has shown tremendous growth , 420% since June '06. Is this any indicator that Visa will show similar trends? How closely tied are all the companies in this industry? I'm sure there's a word for it , you business majors learn, for an industry that for the most part goes up and down in unison. Thoughts ?