> In 2015, the local government bodies serving Philadelphia collected $3,004 per capita in local taxes, the fifth-highest total among the 30 cities. This figure includes taxes on income, sales, property, and businesses, on residents and nonresidents; the City of Philadelphia imposes a broader range of taxes than most other municipalities. The local governments serving Philadelphia received $6,303 per capita in revenue from all sources, including state and federal aid

https://www.pewtrusts.org/en/research-and-analysis/reports/2019/03/20/the-cost-of-local-government-in-philadelphia

This is clear evidence the city can't sustain itself, by a wide margin, let alone support anyone else.

Federal and state tax collections from the city do not even approach to cover the $3,299 per capita subsidy that the city receives.