Frame is as: The Boomers are retiring in a "silver tsunami." It's going to be an employee's market for the next few decades.
So, an employer can either:
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Work with a union to have single point of contact to know how to keep workers happy and sticking around the job. Everyone wins.
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Crush unions and lose that single point of contact. Then keep wondering, employee by employee what it takes to keep people around. Play whack-a-mole while spending a fortune on re-training and probably end up paying similar wages the union asked for in the first place. Everyone loses.
A union is to the employer's advantage. A union is capitalism's solution to keeping the bottom from revolting and embracing communism. Unions are good. Unions are American.