[browseatwork]

There is widespread, often reasonable disagreement about what middle class means, either in terms of salary or total assets. Or cultural practice.

It's true, people do under-acknowledge other industries - law, finance, medicine.

http://www.sfgate.com/business/article/Tech-isn-t-biggest-S-...

Average SF health-related salary in 2014 - 67k.

"The industry employs 20 percent of the city’s workers, with nearly 122,000 jobs. The average annual wage across all jobs in the sector — from pharmacists to surgeons to genetic counselors — was $67,410."

When does health stop and tech being? Often it's a fuzzy line.