  We examine various aspects of the normal state phase of ${\rm CuO_{2}}$
planes in the high Tc superconductors. In particular, within the context of the
three band Hubbard model, we study as a function of doping the competition
between a charge density wave phase induced by oxygen breathing modes,
antiferromagnetic order and paramagnetism. To account for the strong electronic
interactions, we use the finite $U$ slave boson method of Kotliar and
Ruckenstein.
