  We investigate the variation of galaxy clustering with luminosity using the
recently completed SSRS2 sample. Clustering measurements based on the two-point
correlation function and the variance of counts in cells reveal the existence
of a strong dependence of the clustering amplitude on luminosity for galaxies
brighter than L*, while no significant variation is detected for fainter
galaxies. We derive a relative bias versus magnitude relation which can be
compared with theoretical predictions. Existing models of galaxy formation
cannot adequately reproduce the simultaneous steep rise of biasing at high
luminosities and the plateau at the low-luminosity end. Improved modeling of
the halo-galaxy relation and larger samples including low luminosity galaxies
are required to draw more definitive conclusions.
