How Wall Street trades student loans

Student loans are a big business. The U.S. has amassed more than $1.7 trillion in outstanding student debt. But while more than 43 million Americans are currently holding student debt, many are unaware of what exactly happens with their loans after they are issued. Billions of dollars worth of student loans are packaged and sold as assets known as SLABS to some of the biggest investors in America. So what exactly are SLABS and how do they help Wall Street profit from student loans?