In their first joint statement since the SARS crisis sent Bay Street for a tumble, the six big banks Tuesday banded together to reassure investors that the market for bank sponsored asset backed commercial paper remains healthy despite the recent near collapse of the non-bank sponsored sector. … Most seriously affected was the so-called third-party commercial paper, or ABCP issued by non-bank firms, worth about $35-billion. Demand for those products dried up last week. Now, with waves from the sub-prime crisis spreading around the globe, concern is focusing on sectors closest to ones that have already been hit, such as bank sponsored ABCP, a market worth about $75-billion.