Historically there are tons of examples: Rockefeller, Mt Gox, US Steel, Bell, Rothschild, Wal Mart, OPEC, the FED, ...
Some of these are cartels or overly dominant players, but you can see what im saying.
OK, now, do you know the difference between a coercive monopoly, and a natural monopoly?
Standard Oil, at it's peak, had 88% of the refinery market. Hardly a monopoly. By the time the regulation came in, they were down to 60-something percent. If anything, the regulation prevented them from losing more. And for a real eye-opener, check the prices of heating oil for that time period, too. MGox, again, does not have 100% of the trades. The only
actual monopoly you mentioned is the Fed, and they are a monopoly only by virtue of government force.
Economies of scale do tend to lead one or two agencies to be dominant players. That does not mean that they have, or even can control, the entire market. And not every industry is one where economies of scale play a major part. Government's stated purpose, the provision of security, in fact, is clearly one of those where
diseconomies of scale come into play.
I don't see how these services provided in these markets don't get provided by fewer and fewer players over time as they unchecked gobble each other up until the whole thing is replaced by corporate fascism.
Again, it comes down to natural monopolies, game theory, and dis/economies of scale. If a company is fairly out-competing all the others, then there is no reason why they should not be the dominant player. "Shenanigans," as you call them, would be prevented, as the natural requirement of a free market. I'd have to go pretty in-depth on free-market law to explain exactly how. Let's just leave it at "Slander is a form of fraud, and fraud is a no-no," for now.
Let's assume that a company manages to become the only player in a particular industry, because they can provide their service more cheaply and effectively than all the others. What then? Can they start to raise their prices? No, because the moment they raise them enough for a competitor to make a profit by undercutting them, that's exactly what will happen. Can they provide poor service? No, because the moment they do, a competitor can enter the market promising better service, and people will pay a little extra. The only way you can sustain a natural monopoly is by maintaining the conditions which allowed you to gain that position in the first place - ie, being the best in the marketplace.
I'm thinking that if agorism addressed this phenomenon, it would have happened a long time ago and remained and we would be living in utopia already.
Agorism, as a strategy, is only about as old as I am. Sam Konkin came up with it in the late 70's. Drastic political change takes longer than 30-odd years to happen.
We are officially 100% off topic lol
Yes and no. Often, something that is seen as going off-topic is actually just striking the root of the problem expressed in the OP.