Final answer:
Collective bargaining is the negotiating tool that helps employers listen to their employees by having a union representative meet the employer.
Step-by-step explanation:
The negotiating tool that helped employers listen to their employees by having a union representative meet the employer is called collective bargaining.
Collective bargaining is the process through which employers and union representatives negotiate labor contracts that cover wages, benefits, working conditions, and other employment terms.
During collective bargaining, the union representative acts as the voice of the employees, presenting their concerns and demands to the employer and working to reach a mutually agreeable solution.