> It implies that more taxes will be needed to pay for infrastructure The dollars that need to be diverted to infrastructure could be invested in education, so

> It implies that more taxes will be needed to pay for infrastructure The dollars that need to be diverted to infrastructure could be invested in education, social programs, parks, and so on. As I understand it, the “unsustainable” argument makes the case that the real costs of maintaining the infrastructure are going to become large enough that there will be no room left without raising taxes (to unsustainably high levels) or (also unsustainably) cut from other also necessary programs. Judging from the ongoing debate about raising the debt ceiling, one might even argue that we’re already there..