We study an electronic model of a 2D superconductor with onsite randomnessusing Quantum Monte Carlo simulations. The superfluid density is used to trackthe destruction of superconductivity in the ground state with increasingdisorder. The non-superconducting state is identified as an insulator from thetemperature dependence of its d.c. resistivity. The value of $\sigma_{\rm dc}$at the superconductor-insulator transition appears to be non-universal.
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