  We use bosonization, retaining band curvature terms, to analyze the Hall
response of interacting bosonic and fermionic two-leg ladders threaded by a
flux. We derive an explicit expression of the Hall imbalance in a perturbative
expansion in the band curvature, retaining fully the interactions. We show that
the flux dependence of the Hall imbalance allows to distinguish the two phases
(Meissner and Vortex) that are present for a bosonic ladder. For small magnetic
field we relate the Hall resistance, both for bosonic and fermionic ladders, to
the density dependence of the charge sitffness of the system in absence of
flux. Our expression unveil a universal interaction-independent behavior in the
Galilean invariant case.
