Why has the United States brewing industry become more concentrated over the last two decades? I think that there is a couple of reason for this trend in the United States. One thing is that the consumption of beer has been slowly declining, in order to raise in market share, companies are having to think of ways to take customers away from other companies. This would lead to the rise in market share for some companies and the decrease or closer of over companies. Another risen is advertisement. Larger companies are able to spend $0.40 per case of beer on advertisement. Smaller companies can’t spend that much on advertisement.