So...it's all mathematical, and down to rations, with no space for the ethereal? I mean, how do you put value on the woman making a choice to sacrifice an aspect of her own life/career in order to carry your child? Not criticizing, just curious.
She does not sacrifice any of her career for the kid, at all, she keeps getting raises, keeps her seniority and accumulating years of experience and keeps getting full pension benefits.
first, there is a father leave, mother leave and family leave. second, there is a normal and a particular "regime" you can choose. we both decided together that she would take the complete family leave and that we'd choose the regular one at one year off. That's a common decision, for her good and our child's. This means that for this full year (and same for the 2 others kids we want), I will pay a very large percentage of the rent, utility, food, fuel, baby stuff, etc. While she stays home with a smaller salary from the government.
during these years where I will pay the large part of everything, we will likely buy a few "significant" goods and she will buy her part back once she gets back to work at full salary. Otherwise, we could simply refrain from buying anything valuable during that time because I would pay most of it and she would get the benefits of using it and upon selling (I won't start to keep tabs of individual stuff we buy and the ratio we paid them!!! when we buy we split, when we sell we split). Same applies for when I was on EI without a job.. if we had to buy something significant, she would be paying most of it, where on the long run, it would be just fair for me to buy back my normal share of it. We've done it for furniture, appliances, vehicle, etc.
You might think it's unfair, but in reality it's like that for the sole purpose of being fair to both. We ar eboth 200% satisfied with that and in 5 years there wa snot even one single argument or doubt about it. We look at our friend that sometimes frown upon the other having a nicer car, or going out more, or whatever, and we appreciate even more our "system".