  As shown by Overhauser and others, the pair-distribution function $g(r)$ of a
many-electron system may be found by solving a two-electron scattering problem
with an effective screened electron-electron repulsion $V(r)$. We propose a
simple physical picture in which this screened repulsion is the
``dressed-dressed'' interaction between two neutral objects, each an electron
surrounded by its full-coupling exchange-correlation hole. For the effective
interaction between two electrons of antiparallel spin in a high-density
uniform electron gas of arbitrary spin polarization, we confirm that this
picture is qualitatively correct. In contrast, the ``bare-dressed'' interaction
is too repulsive, and does not have the expected symmetry $V_{\ud}(r) =
V_{\du}(r)$. The simple original Overhauser model interaction, independent of
the relative spin polarization $\zeta$, does not capture the $\zeta$-dependence
of the correlation contribution to $g(r=0)$.
