O’Brien, C. T. (2004). Indicators of opportunity in higher education. Washington, D.C.: The Pell Institute for the Study of Opportunity in Higher Education. Most students from low-income families (below $25,000 annual income) do not attend college since it appears unattainable. Those who do attend from this group generally attend public two your or proprietary colleges. Most of these students will not complete a four-year baccalaureate degree. Postsecondary education is becoming more stratified by students’ income.