A monopoly is selling its good in Canada where the marginal revenue is 14 and in Japan where the marginal revenue is 6

A monopoly firm is a single seller because there is barriers to entry. In a pure monopoly industry there is a single firm. The barriers to entry are those factors which lead to restriction of entry by the new firms. These are patent laws which restrict entry of new firms. License and copyrights are also example of barriers to entry.

A monopolist firm is a maker and profit-maximizing condition is

MR=MC

Corresponding to this condition quantity is determined and corresponding to this condition on the demand curve price will be determined.

Hence at profit-maximizing quantity, MR and MC will be equal.

A monopoly firm will continue to increase its price until it is in the elastic portion of its demand curve. Hence a profit-maximizing firm quantity and price are fixed at in the elastic range of it demand curve. It means by producing in the range of elastic region, firm marginal revenue will be positive while in the case of inelastic region marginal revenue will be negative.

As it has been given that a monopoly is selling its good in Canada where the marginal revenue is 14 and in Japan where the marginal revenue is 6 but marginal cost is not given. So it cannot be determined whether firm is maximizing profit or not. But it can be said with the given MR of Canada and Japan, that firm should raise price in Canada because MR is more and it should reduce price in Japan because MR is less in Japan for maximizing profit.