This fits my experience so so well. I am first gen American, started at community college, transferred to a good public university and struggled but ultimately graduated with a 3.2 GPA and did OK on GREs. Had zero “social capital” (and had no idea what that was). I was lucky to have a TA (PhD student) who took me under her wing and had me volunteer in her lab a few hours a week and an excellent professor in my last quarter who informed me about internships and helped me secure one specifically targeting minority students (and it was paid!). Anyhow, after gaining a lot of experience though field jobs , I applied and was rejected from many PhD programs and ended up going to a small CSU, racking up student loans and working full time while getting my Master’s. I then applied to one of the better ecology programs with excellent letters of reference and was flatly denied. Again, luckily I had a greater supervisor at a govt agency who was very supportive and together we published a couple of manuscripts. I re-applied to that same ecology programs and was offered a multi-year fellowship (no TAing, no RAing). The only difference in my application was the publications. Now that I am in the program, I look around at a sea of white faces and most of them I have come to find out are straight out of undergrad, no pubs, very little experience, just great grades and test scores and a lot of social capital and opportunity (paid internships, semester at a field station, paid field methods courses, etc) . What a load of crap.