  We prove that the Wess-Zumino model breaks supersymmetry in the low-energy
limit. The mechanism is identical to the breaking of chiral symmetry in quantum
chromodynamics as the low-energy limit is a Nambu-Jona-Lasinio model and the
gap equation has a solution. This happens at a critical coupling at lower
momenta. Instanton liquid plays an essential role in the behavior of the theory
in this limit.
