  Landscape analyses often assume the existence of large numbers of fields,
$N$, with all of the many couplings among these fields (subject to constraints
such as local supersymmetry) selected independently and randomly from simple
(say Gaussian) distributions. We point out that unitarity and perturbativity
place significant constraints on behavior of couplings with $N$, eliminating
otherwise puzzling results. In would-be flux compactifications of string
theory, we point out that in order that there be large numbers of light fields,
the compactification radii must scale as a positive power of $N$; scaling of
the radii and couplings with $N$ may also be necessary for perturbativity. We
show that in some simple string theory settings with large numbers of fields,
for fixed $R$ and string coupling, one can bound certain sums of squares of
couplings by order one numbers. This may argue for strong correlations,
possibly calling into question the assumption of random distributions. We
consider implications of these considerations for classical and quantum
stability of states without supersymmetry, with low energy supersymmetry
arising from tuning of parameters, and with dynamical breaking of
supersymmetry.
