  In recent years it has been learned that scalar superpartner masses and
trilinear couplings should both generically be larger than about 20 TeV at the
short distance string scale if our world is described by a compactified string
or M-theory with supersymmetry breaking and stabilized moduli. Here we study
implications of this, somewhat generally and also in detail for a particular
realization (compactification of M-theory on a G_2 manifold) where there is
significant knowledge of the superpotential and gauge kinetic function, and a
light gluino. In a certain sense this yields an ultraviolet completion of
minimal flavour violation. Flavour violation stems from off-diagonal and
non-universal diagonal elements of scalar mass matrices and trilinear
couplings, and from renormalization group running. We also examine stability
bounds on the scalar potential. While heavy scalars alone do not guarantee the
absence of flavour problems, our studies show that models with heavy scalars
and light gluinos can be free from such problems.
