Answer:
The key economic idea being exemplified is c) People are rational
Step-by-step explanation:
The economists’ assumption is that firms and consumers utilize all available information to attain their goals and weigh all costs and benefits of each action taken. Moreover, firms and consumers only choose an action if the benefits exceeds the costs. Therefore, the action of manufacturing firms to move their operations from overseas back to the US due to the increased preference for US manufactured goods exemplifies that consumers and firms rely on all available information when pursuing their goals.