To enrich a few at the expense of the women themselves. Just a few points off the top of my head:
If the majority of women work, this:
- Almost doubles the available labour, while
- Almost halving the available hourly wages through supply/demand (more supply than demand = low prices, applies to anything including labour).
This means that the wealthy owners of businesses can easily obtain cheap labour (male or female), which simultaneously enriches the wealthy (makes their businesses more profitable), and harms the masses who must now work two jobs to get the same economic value that one job could bring in before.
This means that both parents must work, not just one. So women are forced into the workforce. They are no longer home doing all the things they did before to save money - making and repairing clothing, cooking from scratch, caring for young children.
That means the family must buy clothing instead of making or repairing it. Is more likely to buy pre-prepared or takeaway food. Puts young children into childcare - and must pay for it. And so forth. Society becomes a consumer society, buying many more products of big business that, in the past, they simply did not need.
This means far more money flows through the economy - money which can be taxed at many points, enriching the government. But not enriching the common person, who simply has money flow in and out of their wallet.
High competition for jobs means that everyone tries to have an edge over the other applicants through higher education. People spend far more years in education than they did in the past for the same job - when I worked for a large research organisation, we expected people to have a masters degree before applying for a job as a research technician - but our best old technicians who were approaching retirement had started straight out of high school at the age of 15 with no higher qualifications at all. There was actually no need at all for higher qualification to do the job (the specialist knowledge required could more effectively be taught on the job), but because of competition the educational expectation had grown unnecessarily.
This creates a new market for unnecessary university education - and universities have turned from repositories of knowledge to profitable businesses churning out graduates. This once again enriches the owners and high executives of THESE businesses - while harming the common people, who are now crippled by massive debts to repay that education.
And all the debt induced at all stages of this enriches the banking sector.
I'll stop there. Yes, putting women into the workforce massively boosts the on-paper economy while enriching the few at the expense of the many.