"Economic elites" here being approximated by the "affluent", namely 90th income (why not wealth?) percentile.
> "To be sure, people at the ninetieth income percentile are neither very rich nor very elite; in 2012 dollars, Gilens’ “affluent” respondents received only about $146,000 in annual household income."
Figure 1 on pdf page 10 [1].
[1] https://scholar.princeton.edu/sites/default/files/mgilens/fi...