  Within a supersymmetric unified framework we explore the resolution of the
gauge hierarchy problem taking account of the non-renormalizable terms in the
superpotential. For $[SU(3)]^3$ supplemented by a discrete R parity, we find
the remarkable property that the vacuum configuration corresponding to the
correct gauge symmetry breaking remains flat (in the supersymmetric limit) to
all orders in $M^{-1}_{Planck}$. The grand unification scale arises from an
interplay of the Planck and supersymmetry breaking scales. An `internal'
$Z_3\otimes Z_4$ symmetry protects a pair of electroweak doublets from becoming
superheavy, yielding at the same time the supersymmetric `$\mu$ term' with the
right order of magnitude. The $Z_4$ symmetry also acts as matter parity and
eliminates the dangerous baryon number violating couplings.
