  Spontaneous chiral symmetry breaking in three dimensional ($d=3$) quantum
electrodynamics is understood as annihilation of an infrared-stable fixed point
that describes the large-N conformal phase by another unstable fixed point at a
critical number of fermions $N=N_c$. We discuss the root of universality of
$N_c$ in this picture, together with some features of the phase boundary in the
$(d,N)$ plane. In particular, it is shown that as $d\rightarrow 4$,
$N_c\rightarrow 0$ with a constant slope, our best estimate of which suggests
that $N_c = 2.89$ in $d=3$.
