"Federal student loans are like no other loans," says Alisa Cunningham, research chief at the Institute for Higher Education Policy.

“联邦学生贷款不同于其他贷款。”高等教育政策研究所的研究主管艾丽莎·坎宁安说。

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The National Home Education Research Institute puts the number even higher, at between 1.8m and 2.5m.

国家家庭教育研究院给出的数据更大， 介于180万和250万之间。

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This year's survey (administered by the Higher Education Research Institute at the University of California at Los Angeles) included nearly 350, 000 students at 665 American colleges and universities.

ECONOMIST: A long way from flower-power

Doubling the subsidized rate could also have discouraged students from seeking federal aid or pushed many toward cheaper public institutions or two-year community colleges, said Ronald Ehrenberg, director of the Cornell Higher Education Research Institute and a professor of labor relations and economics.

FORBES: Student Loan Rates To Remain Low, For Now