3. Suppose Big Country can produce 80 units of X by using all its resources to produce X and 60 units of Y by devoting all its resources to Y. Comparative figures for Small Nation are 60 of X and 60 of Y. Assuming constant costs, in which product should each nation specialize? Explain why. What are the limits of the terms of trade between these two countries? How would rising costs (rather than constant costs) affect the extent of specialization and trade between these two countries? [LO19.1]