<p>Joe Biden is doing all he can to detach the cost of an education from the value of an education.</p><p>Amid the stir caused by President Joe Biden’s plan to cancel student loan debts, far too little attention has been paid to another far-reaching reform: the administration’s change to a lending program known as income-driven repayment (or IDR). If widely applied, Biden’s proposal would provide additional relief to millions of borrowers — and make the U.S. student loan system even costlier and more dysfunctional than it already is.</p>