4. (2.5 p.) A price-discriminating monopolist sells both in its home market at price P. and in a foreign market at price P, > P.. Assume that his marginal cost curve is upward sloping and marginal revenue is diminishing at every market. Will this monopolist increase/decrease/or keep constant the sales in the foreign market if willingness to pay of domestic consumers falls by 50%? Provide (i) graphical solution (with comments) assuming linear demand; and (ii) algebraic solution for any (not necessarily linear) demand curves. 4. (2.5 p.) A price-discriminating monopolist sells both in its home market at price P. and in a foreign market at price P, > P.. Assume that his marginal cost curve is upward sloping and marginal revenue is diminishing at every market. Will this monopolist increase/decrease/or keep constant the sales in the foreign market if willingness to pay of domestic consumers falls by 50%? Provide (i) graphical solution (with comments) assuming linear demand; and (ii) algebraic solution for any (not necessarily linear) demand curves