Unless I'm explicitly buying something with cash, I'm almost always in the state of no cash, but with my phone.

The last time I had cash on my person, it was because I was traveling, and wanted some on hand. I haven't carried cash, as a rule, in almost a decade.

I'm not in the valley, but I have the opposite policy: I systematically use cash unless it is not possible to do so. (It's better for privacy.)

I have your policy, but for a different reason: I generally don't want the merchant to be charged a fee for the transaction.

Totally valid reason. I use cards for the sake of ease of tracking and protections offered by cards. I wish there were an optimal situation wherein you had privacy and protection both.

Yep, here in NZ I never have cash and make electronic payments for everything (even $1 convenience transactions).

I just created a poll to find out the statistics among HNers. Please vote: https://news.ycombinator.com/item?id=5377521

I have a feeling that it's regional. I live in Boston, and there are still significant amounts of restaurants that don't take credit cards.