  We address the problem that dynamical masses of high-redshift massive
galaxies, derived using virial scaling, often come out lower than stellar
masses inferred from population fitting to multi-band photometry. We compare
dynamical and stellar masses for various samples spanning ranges of mass,
compactness and redshift, including the SDSS. The discrepancy between dynamical
and stellar masses occurs both at low and high redshifts, and systematically
increases with galaxy compactness. Because it is unlikely that stellar masses
show systematic errors with galaxy compactness, the correlation of mass
discrepancy with compactness points to errors in the dynamical mass estimates
which assume homology with massive, nearby ellipticals. We quantify the
deviations from homology and propose specific non-virial scaling of dynamical
mass with effective radius and velocity dispersion.
