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The interaction-induced orbital magnetic response of a nanoscale system,modeled by the persistent current in a ring geometry, is evaluated for a systemwhich is a superconductor in the bulk. The interplay of the renormalizedCoulomb and Fr\"{o}hlich interactions is crucial. The diamagnetic response ofthe large superconductor may become paramagnetic when thefinite-size-determined Thouless energy is larger than or on the order of theDebye energy.

Scale-dependent competing interactions: sign reversal of the average persistent current