Final answer:
Comparative advantage and specialization lead to gains from trade and an increase in total world production.
Step-by-step explanation:
Gains from trade as a result of comparative advantage and specialization can be shown by comparing total world production. When each country specializes in its comparative advantage and produces no other good, there is 100% specialization. This leads to an increase in total world production. By comparing the total world production in Table 33.3 to that in Table 33.6, we can see the gains from trade and specialization.