Professor Christian Weller, a senior fellow at the Center for American Progress and professor of public policy at the University of Massachusetts Boston, has again kindly agreed to lend his time and expertise with Credit Slips readers. As an economist, Professor Weller can offer insights that us regular bloggers often cannot offer. With all that is crashing down going on around us, it seemed a particularly good time to invite him back, and we're thrilled he can do it. Welcome back Professor Weller.