In Gilens and Page 2014 Testing Theories of American Politics, economic-elite domination is the ideal-type theory that individuals with substantial economic resources have substantial influence over policy outcomes. The article tests this using policy preferences at the 90th income percentile as an imperfect proxy for economic elites.
Use this concept for the paper's category-level finding that affluent preferences remain positive and statistically significant in multivariate models of federal policy adoption. The source supports modeled policy responsiveness to an affluent-preference proxy, not identification of specific wealthy actors.
Do not use this concept page to imply coordination, intent, control, sponsorship, donor motive, or specific elite action. The article itself says the proxy does not distinguish among the top 1 percent, top 0.1 percent, or less affluent high-income actors.