Evolution of the B‐band quasar luminosity function. Here the data points are taken from Fan et al. (2001; triangles) and Pei (1995; circles), as compiled from Hartwick & Schade (1990) and Warren et al. (1994), and from Barger et al. (2003; squares), as converted from the X‐ray in WL03. In all panels the solid lines show the simple WL03 model, with ﹩F=1.0﹩.