I'll use my wife and I as examples, she it's a behavior analyst for austistic children and I'm a teacher, so we are solidly middle class. Even under an income based repayment schedule we pay about 25% of our take home pay each month in student loans. Money we would be spending on cars, home remodeling, or even traveling. All points where that money goes into the actual economy and not to federal loans. There are many in the under 40 crowd that share this reality. It is of monumental economic impact. 20/30 years ago we were the people buying houses and cars and now many wait years to start families or make major purchases because large shares of debt, that is inescapable by any means, hangs over us.