We suggest that the standard model may undergo a supercritical transit
ion near the Landau scale, where the U(1) gauge-boson couples to the l
eft- and right-handed states of any given fermion with different charg
es. This scenario naturally gives rise to three generations of fermion
, corresponding to the three critical scales for the right-right, righ
t-left and left-left fermion interactions going supercritical, as well
as CP-violation in the quark sector.