there is only an indirect link.
a 1 (or 0) ipc terr cant get a factory, and thus cant produce anything
a 2 ipc terr cant get a major factory, an is thus limited to 3 units produced
a 3 or more terr can build a major IC an is limited to 10 units produced (this is only a limitation for eastern and central USA with production of 12 and 20 ipcs)