If guards was a business, don't business's tend to get bigger and bigger. What if over time there becomes a monopoly, or even a duopoly. Then we are basically back to government.
Except not.
Here's a quote from Wikipedia's page on
Monopolies:
Monopolies can be established by a government, form
naturally, or form by mergers. A monopoly is said to be
coercive when the monopoly actively prohibits competitors by using practices (such as underselling) that derive from its market or political influence.
The links are maintained from the original text, I suggest you read all three articles, but I'll summarize here:
A monopoly like that which you describe is a natural monopoly, one that, due to economies of scale, becomes the sole provider in a market. It is prevented from the sorts of abuses typically attributed to governments and other coercive monopolies by the fact that it is in a rather precarious position - it maintains it's spot at the top of the pile by having the best services available for the best prices profitable.
A coercive monopoly, such as government or any of the various other monopolies that it allows or establishes, on the other hand, is the sole provider in a market due to force. Any coercive monopoly would be rightly viewed as illegitimate, and absent laws preventing competition, would quickly fail, or start playing nice.
It should also be pointed out that the answer for a feared concentration of power is not a concentration of power.
Hero member folks.
