Final answer:
The statement is true; international trade enables access to a wider range of goods and services, and countries that participate in it tend to fare better economically.
Step-by-step explanation:
The statement that "Without engaging in international trade, Shenandoah and Rainier would not have been able to consume at the after-trade consumption bundles" is true. Engaging in international trade allows regions or countries to specialize in the production of goods and services they can produce most efficiently while importing others that they cannot produce as effectively. This exchange increases the variety of goods and services available to consumers, often at lower costs due to comparative advantages. History has shown that economies which engage in international trade tend to perform better than those which do not. For example, significant economic growth in recent decades has been experienced by countries like Japan, South Korea, China, and India, which have integrated heavily into the global market. Conversely, there are no examples of economies that have remained isolated from international trade and still achieved prosperity.