The document discusses what an infrastructure bank is and its role in infrastructure funding in Canada. An infrastructure bank would provide a central source of loans and loan guarantees to help municipalities finance infrastructure projects like roads and bridges. It would use the federal government's strong credit rating to make financing these projects easier and more affordable. However, there are also risks like projects needing tolls or fees to cover costs, whether projects will pass stress tests and risk assessments, and whether taxpayers would be responsible for covering losses.