Sorry, I was referring to this part:
It also fails to take into account that Mona could spend $2 a day to take light rail or bus downtown, spending $500 on transit, instead of driving, and saving $1500 (plus not having to worry about parking.)
Not everyone who works downtown has to pay for parking. And not everyone in the suburbs has to work downtown. I realize what it's comparing, but it also makes a lot of assumptions and takes place in a perfect world. There is a lot more stop and go traffic downtown, I'm sure insurance costs more based on zip code(s) and you need to travel outside of downtown for much of your shopping. Plus, there isn't a grocery store on every corner.
As long as we're assuming, Susie Suburb could car pool or park and ride light rail into downtown. Or, Mona Midtown could have a less fuel efficient car because she doesn't have as long of a commute. Sure, in the real world, we all know Susie Suburb would have a v8 Sequoia and have spent $10,000 a year on Starbucks
