But which friend determines what all of his/her other friends will end up buying? I get what you're saying. I bought Halo 2 because my friends were all in to it. I'm simply brainstorming though about how it came to be that all my friends had it. I mean at some point, nobody had it; therefore, there couldn't have been any friends to influence that first purchase. At what point does it snowball into the bandwagon effect Danny is highlighting?