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When the Starbursts cost a cent apiece, the average number of candies per customer was 3.5, but when the price went down to zero, the average went down to 1.1 per customer. The students limited themselves to a large degree when the candy was free. In fact, almost all the students applied a very simple social-norm rule in this situation__hey politely took one and only one Starburst. ... What these results mean is that when price is not a part of the exchange, we become less selfish maximizers and start caring more about the welfare of others. We saw this demonstrated by the fact that when the price decreased to zero, customers restrained themselves and took far fewer units.
Dan Ariely Predictably Irrational: The Hidden Forces That Shape Our Decisions
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When the Starbursts cost a cent apiece, the average number of candies per customer was 3.5, but when the price went down to zero, the average went down to 1.1 per customer. The students limited themselves to a large degree when the candy was free. In fact, almost all the students applied a very simple social-norm rule in this situation__hey politely took one and only one Starburst. ... What these results mean is that when price is not a part of the exchange, we become less selfish maximizers and start caring more about the welfare of others. We saw this demonstrated by the fact that when the price decreased to zero, customers restrained themselves and took far fewer units.
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Dan Ariely

Predictably Irrational: The Hidden Forces That Shape Our Decisions

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Monopoly is a market, or part of a market, reserved to the exclusive possession of one or more sellers by means of the initiation of physical force by the government, or with the sanction of the government. Monopoly exists insofar as the freedom of competition is violated, with the freedom of competition being understood as the absence of the initiation of physical force as the preventive of competition. Where there is no initiation of physical force to violate the freedom of competition, there is no monopoly. The freedom of competition is violated only insofar as individuals are excluded from markets or parts of markets by means of the initiation of physical force. Monopoly is thus a market or part of a market reserved to the exclusive possession of one or more sellers by means of the initiation of physical force. It is thus something imposed upon the market from without__y the government. (Private individuals__angsters__an initiate force to reserve markets only if the government allows it and thereby sanctions it.)Thus, monopoly is not something which emerges from the normal operation of the economic system, and which the government must control.