Two things.
1. There is no income gap
2. Unless you became a parent by accident then it is likely an act you did for selfish reasons. No one becomes a parent because it serves the public.
1 - Maybe if you provided some
evidence it would be helpful
2 - Everyone does everything for selfish reasons. No-one is a police officer or firefighter or soldier purely to serve the public; they are remunerated because those roles are necessary. Having children is necessary too, and truth be told it will always mean
some career sacrifice to take time away from work. But with birth rates demonstrably declining in most/all developed countries, it certainly makes sense to reduce the impact of that sacrifice.
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"population growth takes a nosedive."
Population growth taking a nosedive is probably needed honestly.
As far as families having kids well fine have them, but don't blame others for your difficulties with it.
A gradual population decline might be a good thing, though certainly accompanied by problems of its own (eg. higher aged care costs being borne by a smaller tax base); that's part of why I suggest parental allowances should start decreasing after the first or second child. However the drastic nosedive population would take if lower and middle demographic families stopped having kids because they can't afford a nanny or stay at home mum would certainly
not be a good thing.
As a society - any developed country - we
need women to keep pushing out an adequate supply of babies. Given the demonstrable income gap and already declining birth rates, without parental leave (and if some had their way, any other parenting allowances either) that might not happen.
And this is quite aside from the fact that in the case of those who have kids anyway, despite the career costs, there's a strong social (and moral) case for trying to ensure that those kids have a decent upbringing; not being raised into deprivation leading ultimately to crime.
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So the business shoulders the cost of the person on leave and also shoulders the cost to train a temp employee that may be sub-par and cost the business monies. If anyone thinks this will not impact employing women they are mistaken. Why on earth would a business employ anyone that is almost certain to be a liability?
Do you think it's good for a business having employees depressed because their options for having children are severely restricted or non-existent? Or having new parents anxious and distracted because the most important thing in their world is in the care of strangers at a baby farm?
Businesses can make their own decision to pay parental leave at their own expense in those cases; or to simply fire those employees. Recognising it as a public issue benefits businesses as well as prospective mothers/parents.
You don't hire a green recruit to fill a temporary role; either get an experienced professional who is looking for temporary work, or shuffle staff around a bit, do a little internal training where needed, and hire the new person for a less difficult/important job. It would have to take a very special business which finds itself incapable of adapting to an employee's absense when they are given 4-6 months' advance warning of it! What do they do when someone quits?