First row, for https://livingwage.mit.edu/counties/06075
| 1 adult | 2 adults (1 working) |
| 0 Children | 1 Child | 2 Children | 3 Children | 0 Children |1 Child | 2 Children | 3 Children |
| $29.31 | $61.37 | $83.72 | $107.95 | $41.83 | $50.47 | $54.77 | $63.97 |
1 adult + 0 children = $29.31
2 adults + 0 children = $41.83
The only way these numbers make sense if if you assume one income. Then 1 adult + 3 kids = $107.95
2 adults + 3 kids = $63.97
Given the first example was one income, this 2nd one makes no sense. 5 people cost more than 4. These numbers are wrong.Also, two adults (assuming married) will pay lower taxes than one adult for the same income. That's another ~30k difference per year in the breakdown table for the 3 children case. If your tax burden is lower, you can afford a lower wage while bringing in the same net.
EDIT: Tax rates in the US are roughly half (except for high income earners, way beyond these living wage estimates would be relating to) when you're married versus single.
https://www.irs.gov/filing/federal-income-tax-rates-and-brac...
Check out the 22% bracket on that page, the range is doubled for married people filing joint versus single. That's a huge savings each year. Tax savings of two married people and any number of kids is a major contributor to why the living wage drops when someone gets married versus is single with the same number of kids.