Are student loans the new subprime mortgages? Among professional skeptics, the comparison has become something of a cliché, and in last weekend’s front page story, entitled “A Generation Hobbled by College Debt,” the New York Times invoked it in recounting the nightmare that student loans are becoming for so many. At the same time, others have pointed out important differences between the two kinds of debt. But history never repeats itself exactly – and there are reasons to fear that the growing mountain of student debt could have every bit as profound an impact on our economy as the housing bubble did.