Having worked for a long time in a variety of areas, I'd say it's a question of what is voluntary. I may voluntarily work part-time if I can't find child care. That's my choice: I choose to work part-time because I don't have the other options.
In fact, the studies we've done and that have been done by other independent agencies show quite clearly that if the supports are there for women of all ages to work full-time, they will choose that option; I think it's about 66% of women who will do that.
If you can't find the jobs or you can't find the schedules to work around, or.... As the sister here has said, we have women holding down two and three part-time jobs. Are those women voluntarily working two and three part-time jobs? No, they're trying to get one full-time income out of a variety of part-time jobs. Part-time work means full-time poverty.