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<p>Well, yes. That is what I assumed in saying “unregulated;” that rights would be respected. I meant that the government would not artificially interfere with market forces, thus creating a laissez-faire system. I should have clarified; I suppose all markets are regulated in this manner to a certain extent.</p>
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<p>The legal system still hasn’t effectively combated pollution, mainly because it is nigh on impossible to find a “true cost” for the effect an individual actor has upon pollution, due to all the secondary effects pollution can have. Governments have attempted to create taxes, following Arthur Pigou’s idea, but, taxes on pollution have to be individual in order to ensure each business pays fairly, and that larger contributors are taxed more, creating incentives for them to cut pollution. But I digress.</p>
<p>Yes, such external costs are a market failure because the results of these costs are not seen. These costs aren’t reflected in market prices because the actor doesn’t have to face the social costs of its actions. But we still can’t effectively combat these, even with regulation.</p>
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<p>So, basically, a monopoly? </p>
<p>In your example, another person could see the higher returns, and make an investment to dig another well to capitalize on the profits. If he did not individually have enough money, he could ask each townsperson for a certain amount, and then use all of the money to create a well, distributing profits proportionally and competing against the monopolist. Profits would still remain high for both of these producers, attracting more competitors to enter until the price is driven to the margin price.</p>
<p>Monopolies cannot last as long as there are no barriers to entering the market, like initial expenses or governmental policies. As long as any firm has the ability to freely enter a market, a monopoly will be forced to remain efficient and keep prices low due to the fear of attracting competition.</p>
<p>There are markets, like phones for example, where the barriers to entry make monopolies more cost efficient. Due to the immense cost of creating a telephone network, other firms cannot enter and compete against a well established firm. However, if the telephone monopolist charges too much, he may make it profitable for a prospective competitor to enter, so, he has to ensure a certain degree of efficiency in his procedures to keep a viable market price.</p>