"Undercutting competitors" and "buying market share" is literally what defines competition. And this is phenomenally good both for the consumer and for the companies that are able to slim themselves down enough to succeed.
Comcast, for instance, isn't really a monopoly. There are numerous other big players in that industry. But the thing is that instead of "undercutting competitors" and "buying market share" the competitors all agree to cooperate and split up the market. The result is when you buy something from Amazon, you're hitting quite close to the wholesale cost of that item. And when you pay your high speed internet bill to Comcast, what you're paying is some large multiple of the real cost of service.
Comcast, for instance, isn't really a monopoly. There are numerous other big players in that industry. But the thing is that instead of "undercutting competitors" and "buying market share" the competitors all agree to cooperate and split up the market. The result is when you buy something from Amazon, you're hitting quite close to the wholesale cost of that item. And when you pay your high speed internet bill to Comcast, what you're paying is some large multiple of the real cost of service.