  The transport in a pure one-dimensional quantum wire is investigated for any
range of interactions. First, the wire is connected to measuring leads. The
transmission of an incident electron is found to be perfect, and the
conductance is not renormalized by the interactions. Either Landauer's approach
or Kubo formula can be used as long as the reservoirs impose the boundary
conditions. Second, the Kubo formula as a response to the local field is
reconsidered in a generic Luttinger liquid: the ``intrinsic'' conductance thus
obtained is determined by the same combination of interaction parameters as
that which renormalizes the current.
