  We calculate the most general effective potential for the massless Thirring
model in dependence of the local fields of all fermion-antifermion collective
excitations. We analyse the minima of this potential describing different vacua
of the quantum system. We confirm the existence of the absolute minimum found
in EPJC 20, 723 (2001) corresponding to the chirally broken phase of the
massless Thirring model. As has been shown in EPJC 20, 723 (2001) this minimum
is stable under quantum fluctuations.
