Unions protesting a prospective policy is the same signal as as a behemoth suing a small startup that encroaches their space: they know vouchers would wreck the

Unions protesting a prospective policy is the same signal as as a behemoth suing a small startup that encroaches their space: they know vouchers would wreck their monopoly more than anyone else, so they need to stop it before it begins. If you are unsure if vouchers are a good policy, that unions protest so hard against them should put you at ease that they work.