The physics case of DAFNE-2

We present the physics case of DAFNE-2, an $e^{+}{e}^{-}$ collider expected to deliver 20-50 fb${}^{-1}$ at the $\varphi (1020)$ peak, and $\sim$ 5 fb${}^{-1}$ in the energy region between 1 and 2.5 GeV.