Final answer:
It is true that union contracts limit management's ability to change job descriptions, as these contracts define employment conditions through collective bargaining. This contrasts with the Necessary and Proper Clause, which expands rather than limits federal powers.
Step-by-step explanation:
The statement 'Union contracts limit management ability to change job descriptions' is true. Union contracts often include provisions that specify job duties, working conditions, and other employment-related matters. These contracts can restrict management's ability to unilaterally change job descriptions without negotiating with the union. This protection is part of the collective bargaining process that unions engage in to advocate for worker rights, job security, and fair wages. Given the historical context of employees being forced to work long hours at low wages without the right to unionize, these contracts play a critical role in establishing a balance of power between employees and employers.
In contrast to the premise of Exercise 9.3.1, the Necessary and Proper Clause in the Constitution does not limit the power of the national government. Instead, it is false to state that it limits national power; the clause actually grants Congress the authority to pass laws that are deemed necessary and proper for carrying out its duties, thereby expanding federal power.