How can the minimum wage earner contribute half of the joint spendings of his/her income when even their entire income wouldn't be enough to live properly in many cities? Should the couple then move into a bad area and live in a shared apartment just so the lower earner can afford it? What about homemakers and partners who have taken a break from work for a few years, be it to pursue higher education, take care of children, manage a severe health condition like cancer, or recuperate after a serious accident? Should they then leave the house as they cannot contribute 50% of the rent, groceries, and other bills?

Clearly, if only one member of the household is earning, there is no question of sharing expenses. Voluntary unemployment like pursuing higher education is a choice and a huge financial outlay, which needs to be planned in advance. Illness or loss of job is where your emergency fund/ health insurance kicks in. Homemakers contribute labor to the household and it is understood at the outset that the spouse will bear all financial responsibility.

Lastly, your so-called bad areas, people live in them.