Frame is as: The Boomers are retiring in a "silver tsunami."
Employers 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
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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
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.