  We study the naturalness of electroweak symmetry breaking and baryogenesis in
the next-to-minimal supersymmetric standard model (NMSSM). Our study is
motivated by the recent LEP bounds on the Higgs boson mass which severely
constrains the low \tan\beta region of the minimal supersymmetric standard
model (MSSM). We show that the low \tan \beta region of the NMSSM is clearly
favoured over the MSSM with regard to the physical Higgs boson mass,
fine-tuning, and electroweak baryogenesis.
