(a) One‐dimensional velocity dispersion on 1 h⁻¹ Mpc scales as a function of local density for N‐body points from simulations of a standard CDM universe at three different redshifts. (b) Dark matter velocity dispersion as a function of dark matter density at z = 0, compared to the velocity dispersion of galaxies from the same simulation as a function of the galaxy density. (c) Same as (b), but with the dark matter density and velocity dispersion scaled for a density bias b = 1.6 and a velocity bias of 80%.