雅思阅读材料：University Slots

　　In the first half of the 20th century, growth in high school graduation was the driving force behind increased college enrolments. The decline in high school graduation since 1970 (for cohorts born after 1950) has flattened college attendance and completion rates as well as growth in the skill level of the U.S. workforce. To increase the skill levels of its future workforce, America needs to confront a large and growing dropout problem.The origins of this dropout problem have yet to be fully investigated. Evidence suggests a powerful role of the family in shaping educational and adult outcomes. A growing proportion of American children are being raised in disadvantaged families. This trend promises to reduce productivity and promote inequality in the America of tomorrow.

　　Mr Heckman tends to focus his policy solutions on the very young where, he has argued, remediation efforts bear the most fruit. At the same time, it’s possible that the relative lack of success of remediation efforts later on in a student’s career is directly related to the above state of affairs.

　　There is a wage premium earned by high school graduates relative to non- graduates, but its pretty small—much smaller than the gap between high school graduates and those with college degrees. The big advantage of a high school diploma is that it clears the way for a student to move on to the next level.

　　But the next level is increasingly out of reach for disadvantaged students. Money is occasionally the problem, but competition may be more of an issue. Disadvantaged households do not have the resources to invest in preparatory courses or multiple admissions applications. Students may not have the time after school to participate in extracurricular activities, needing, instead, to work. And disadvantaged students are unlikely to get the parental pressure at home to continue investing in activities designed to enhance competitiveness in admissions.

　　Perhaps the increasing competitiveness of college admissions processes are leading more students to conclude that college is out of reach—which is therefore reducing the return to a high school diploma and increasing the dropout rate.