It is shown that pseudomonotone and quasimonotone maps can be characterized
by a first order property provided they are regular. This result extends t
he well known characterization of nonvanishing generalized monotone maps to
an essentially larger class. The paper supplements a recent contribution b
y Crouzeix and Ferland (1996) and solves a related open problem concerning
homogeneous excess demand functions which occur in general equilibrium theo
ry.