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low wage earners 

Not just low wage earners but middle class working parents. Childcare is literally as much as a starting salary so two middle class working parents have to make a choice of whether one of them leaves the workforce for a few years or work and basically pay off childcare. 
So, A). Leave the workspace and never likely get your old position and career path again (4-5 year work gap is a big deal) or B). Continue working and come out net neutral.
A great idea for Michigan and one that needs to be adopted nation wide. Childcare is especially difficult to secure for low wage earners and the cost is a major reason why younger generations are waiting longer to have kids or opting out altogether.