constant multiplicative factor of the Green’s function, the renormalized and unrenormalized curves for current or linear conductance roughly differ by a nearly constant scaling factor [cf. Eqs. (16) and (24)]. It is tempting to relate this to the fact that, in spite of substan- tial quantitative discrepancies, this is just the basic difference between the calculated and measure curves observed in some cases. In the present paper, we have presented a theoretical approach to correlated molecular transport relying upon a clear physical concept, namely that of a sufficiently large extended molecule. The analysis of the present numerical results obtained for a simple but non-trivial correlated case has indicated that this approach can be legitimately applied to the molecular transport in real systems. Computing the Green’s functions within accurate quantum chem- ical calculations appears to be a feasible task for the isolated medium-size molecules needed. This is particularly true for narrower-band (organic) electrodes, but wider-band (metallic) electrodes can still be tackled especially in the most frequent situations of non-resonant tunneling. To remedy the stronger size-dependence for wider-band electrodes closer to res- onance, we have suggested that simple renormalization procedures inspired by the Landau Fermi liquid theory can work, because it is unlikely that electron correlations in the systems of interest for molecular transport could invalidate the latter. Although our main interest was not the IRLM, we still note that the counter-intuitive theoretical prediction, that the contact electron-electron interaction could enhance the conductance, is interesting and can make the object of a parallel experimental investigation. I. B. thanks Jochen Schirmer for valuable discussions and Uri Peskin for useful remarks. The financial support for this work provided by the Deutsche Forschungsgemeinschaft (DFG) VIII. CONCLUSION Acknowledgments 23