  The origin of the luminosity dependence of the equivalent width (EW) of broad
emission lines in AGN (the Baldwin effect) is not firmly established yet. We
explore this question for the broad C IV \lambda 1549 line using the Boroson &
Green sample of the 87 z < 0.5 Bright Quasar Survey (BQS) quasars. Useful UV
spectra of the C IV region are available for 81 of the objects, which are used
to explore the dependence of the C IV EW on various emission properties. We
confirm earlier results on the strong correlations of the C IV EW with some of
the emission parameters which define the Boroson & Green Eigenvector 1, and
with the optical to X-ray slope \alpha_ox. In addition, we find a strong
correlation of the C IV EW with the relative accretion rate, L/L_Edd. Since
L/L_Edd drives some of the Eigenvector 1 correlations, it may be the primary
physical parameter which drives the Baldwin effect for C IV.
