Any real economist can cite many monoplies that arise through market forces alone.
> Inevitably, if any industry is profitable, competition will arise.
This is not true. There are many different definitions of "profit", and there are many cases where an industry that makes a real business profit will not support a competitor that makes an economic profit. The obvious example is markets with very large economies of scale [1].
> Government regulation (often through corruption) is the only mechanism which ensures a lack of competition. This can be observed in any industry throughout the last 100 years.
I'm interpreting this to mean "only through government intervention can we ensure a lack of competition". Again, this is not true. Any party that can make a massive capital investment (which already vastly reduces the pool of competition) can enter a space and make any future entrance by a competitor completely unprofitable.
To see an example of this, lets go a century back in time to the day of Standard Oil. Standard Oil was notorious for leveraging its massive capital advantage to destroy its competitors. It would enter a new market and lower its prices (leveraging its massive war chest). Once its competitors left business, it would raise prices again to screw over consumers. After many people caught wind of this blatant market manipulation, it turned to deceptive practices and things like tying agreements [2].
What government policy led to the dominant monopoly of Standard Oil?
> You're right that companies can lock up the vast majority of a market by out-competing others, but this generally doesn't last very long (typically a decade or less).
Standard Oil was supreme for over thirty years. If only we could invent a time machine, to hear the gales of laughter from the businessmen of the day at the notion that Rockefeller became the king of oil by "out-competing" others.
He became dominant through backroom deals and anti-competitive practices. Government intervention was what finally ended the Standard Oil monopoly. It was also likely the only thing (barring the death of Rockefeller or some kind of market shift) that ever would.
1. http://en.wikipedia.org/wiki/Economies_of_scale 2. http://en.wikipedia.org/wiki/Standard_oil#Monopoly_charges_a...