A good point that exposes some major bias behind my anecdote. With that said, if these expectations start at elite schools and slowly trickle down, would that not cause a rise in the aggregate across all teenagers over time?
Seems like a strong assumption that it necessarily does splash damage beyond a certain cohort. I went to a public HS of 4K in the 00s only AP Juniors/Seniors were concerned with this kind of thing and AP kids were only friends with other AP kids (for obvious reasons); I'd doubt that've changed by 2012.
I only know this cohort well enough because I was on the debate team which most've them used as an extra-curricular for their college application CV but weren't serious about winning.