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Illustration of a strategic barrier

An illustration of a strategic barrier would be a: (w) high-technology firm registering a patent on their newly-designed time machine. (x) law establishing the USPS as the only mail service in the United States. (y) set of costly advertising campaigns by established firms to discourage potential competitors from entering an oligopolistic market. (z) firm selling excess inventory at low prices to create instant profits.

Can someone explain/help me with best solution about problem of Economics...

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