Above the minimum average variable cost curve, the marginal cost curve is not the supply curve of a monopoly since, unlike purely competitive firms, firms along with market power: (w) attempt to maximize economic profit in the long run. (x) base the quantities to produce and consequent prices they charge on the structure of negatively-sloped demand curves they face. (y) can invariably stop entry by potential rivals in the long run. (z) are capable to operate in international markets, and require to take global factors into account.
Can anybody suggest me the proper explanation for given problem regarding Economics generally?