Philadelphia and any other large city can have its own bank. It can use this bank to finance at zero or near percent interest: community development, infrastructure, schools or whatever else is decided in the bank's mission statement. This video is targeted at those who will be attending a meeting to determine what the mission of this public bank should be.
Here is a video that outlines the risk to taxpayer funds held by schools, universities, municipalities, counties etc if they are deposited in a big bank.
This video may be useful to present to public officials to inform them of the dangers of losing public funds under their care.