It's very clear ...

Women who can get affordable day care for their children are able to return to the workforce sooner than would otherwise be the case. Their earnings are taxed and that money goes to the federal coffers. If they couldn't earn and contribute to productivity they wouldn't be paying taxes.  Read this:

http://www.theglobeandmail.com/news/national/public-daycare-helps-fuel-quebec-work-force/article708141/