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International Economics Olympiad, 2019, 7–11 классы, Multiple choice
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Тестовый вопрос
Which of the following statements best describes the concept of network externality?
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The service is provided on-line.
Producer uses multilevel marketing to attract new customers.
The individual utility of using a service increases with the total number of users.
The marginal tax rate increases with an increase of income.
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