Im not to familiar with JP Morgan or Rockefeller on this issue, but US Steel was only able to hold its monopoly because it kept prices lower then ANY other Startup Company could counter, what happened when anti-trust was applied? US steel skyrocketed and the entire steel industry in America began a massive downward spiral.
And for the railroads, im assuming you mean the westward expansion. This was solely caused by government subsidize. America was establishing industry in the west, the government wanted to capitalize on this. Big brother gave out free land grants to a railroad that had otherwise no way of making profit on said line. Thanks to this money it was the only line to connect the east and west and no compition could arrive until it was made profitable, once this happened, the original company went out of business.
For Microsoft (and walmart)see US steel, same situation different product. Linux/Mac will never be able to mess with Microsoft until they develop a product of equal or greater value and sell it cheaper.
Unjust monopolies cannot exist in a laziez-faire system, the only way to have a monopoly is by being the best/providing the cheapest product, you cannot reap retarded profits and get away with it
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