Final answer:
A labor union may engage in work slowdowns, strikes, and work stoppages to increase its bargaining power and add force to its demands. However, collaborative negotiations are not a method used by unions for this purpose.
Step-by-step explanation:
A labor union may engage in all the following to increase its bargaining power and add force to its demands:
- Work slowdowns: Unionized workers intentionally reduce their productivity or perform their tasks at a slower pace to put pressure on employers.
- Strikes: Unionized workers collectively refuse to work, typically until their demands are met.
- Work stoppages: Similar to strikes, unionized workers stop working but may remain at the workplace to demonstrate their unity and commitment to their demands.
However, a union may not engage in collaborative negotiations to increase its bargaining power. Collaborative negotiations involve cooperative discussions between the union and the employer to find mutually beneficial solutions.