To add some personal experience to the discussion of economics/class influencing vaccination decisions . . . sorry it's long!
Our 1st child came to us through guardianship and then adoption. She had county/state/fed aid for childcare and health insurance since she was considered a "family of one" with no income. It was very interesting to witness how dd1 and I were treated when I took her to wellness visits. I can say that is was very different from my 2nd dd. When I took my 1st dd in for wellness check-ups they seemed quite taken by surprise when I questioned things.
For example: why were they ordering tests to see if lead was in her bloodstream? "It's just routine screening m'am." They do that for every child who is poor . . . it's assumed that if you are poor you are likely to have lead exposure. It doesn't matter that 75% of the houses around here were built after the routine use of lead in house paint. There were no questions about her history - where had she lived, in older homes? Her bio mom was young but not living in a ghetto.
I was not even asked about vaccine schedules. We had a kindergarten physical while I was researching chicken pox (the vaccine was required for starting school). I had wanted to do more research and had not scheduled any shots for that visit. Nonetheless, in came an MA with a syringe filled with the chicken pox vaccine - assuming I would have that shot done during the visit. When I asked what that was and then said I was still undecided about that vaccine there was an attempt to "just get it done" since I was there and the syringe was drawn. I had to stay firm (always polite) and she finally backed off. But, wow, that never has happened to me since dd1 got out of the county health program.
The paperwork moved so fast that I had to be very quick at reading and making decisions on the fly. If I didn't already have my very stubborn streak of not doing anything that could have potential to do harm without research and at least sleeping on the decision; and if I didn't have a decent knowledge of anatomy and physiology I would have been rolled along just like so many other parents in those waiting rooms. If I had any trouble with reading quickly and having good reading comprehension . . . whoa. English as a 2nd language? Double whoa.
I grew up very poor but have since moved into the middle class. I can see how economics does influence a sense of empowerment and offer a person the chance to feel like they can make their own decisions, not swallow a CDC schedule hook-line-and-sinker. My children's doctor has a very different approach with me and my daughters than those docs I interacted with the first couple years of caring for dd1 through guardianship. It's not just the doctor, but the whole office staff and whole experience of doing healthcare through Kaiser rather than doing healthcare through impacted community clinics.