A. True, Because, in perfect competitive market, firms are price taker and they have bo control over it.
B. True, Because the average cost declines as the number of unit produced increase(due to increasing returns to scale) over the relevant output range.
C. False, Because in oligopoly market there are few no. Of seller and any oligoplist having a large average portion of market share without doing any advertisement is not possible. Advertisement is being done by oligopolist to increase his revenue.
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