^^^^^^^^^^
The gap can also be that - in general - it is astronomically more expensive to develop in an urban area than elsewhere, ESPECIALLY when elements such as legacy infrastructure, environmental contamination and urban design requirements (among many other factors) come into play.

The fact of the matter is that TIF was designed to help level the playing field and make urban development (and redevelopment) easier, in an effort to stem the outgoing tide of cheap sprawl that is the REAL (and crippling) historic misuse of public monies.