> For example, transportation costs are $9000/year and housing is $20000/year. These are both way more than is necessary.

Even on the smaller things. "Internet & Mobile" for where I am jumped out to me. Based on the difference between 1 adult and 2 adults, it's $582 per person-year for mobile (which I guess isn't far off if you get a good new phone every 2 years, it's reasonable enough) and with that subtracted, internet is $100 per month. The methodology page says "County-level data on the cost of internet comes from research on lowest-cost monthly plans from BroadbandNow", but even that page shows much cheaper options available (including the $70 per month Google Fiber I have).

This depends a lot on where you live. In our area, the minimum internet-only offering from Spectrum is $125 (approximately) after taxes/fees, and the only "competitor" is AT&T, which is more expensive for (at least in our area) worse / flakier service.

I was surprised (at least for Birmingham/AL/Jefferson County) how accurately it pegged _most_ of the costs -- childcare here is closer to $12k/annum/child so that one was the only one I pegged as 'off' - they show 2 children as $16k and that's a ~$8k underestimate

I think I have great access. I pay $60/month for gig internet and that’s split with 4 people.

I spend $20/month for mobile and buy a new $500 phone every 3 years.

I make way more than a livable wage, but spend much less than their projected costs.

yeah, I spend $30/month on internet (the 100 Mbps Google Fiber, since I realized I didn't really need 1 Gbps at home now that I go into the office every day...)

I am but a single datapoint, but the $100/month for home internet hits quite close to home. I currently pay $130 for Spectrum's gigabit cable internet plan. Their website offers it for $70, but that's only for the first year; they have raised that price by, apparently, $20 per year I've been a customer. We do not have fiber and my only other ISP option is a DSL provider that maxes out at 40mbps for $30. So sure, I can save about 75% on my internet bill by opting for internet that is 4% of the speed that I currently pay for. And this is in a rapidly growing suburb. I think $100/month is easily the case for places like my home, where local broadband monopolies still exist mostly unchallenged.