Most of the fights are between pharmaceutical companies with the same or similar product on the market, one licensed to do one thing and the other another but are often found they also work for the other. One drug may be cheaper than the other so they end up getting promoted because they are cheaper...so it ends up in a fight between the companies and sometimes they have been overruled because the drugs are so similar it didn't matter except for the cost factor involved. Remember this point as we move further on.