  It is shown that the squeezed limit of inflationary expectation values
follows from reparametrization invariance of the wavefunction of the universe.
This translates into a constraint on the longitudinal modes of functional
derivatives of the wavefunction. Thus, the local non-Gaussianity induced by
single field inflation is purely a gauge artifact, and should not yield a
physically measurable effect. We focus on Einstein gravity in de Sitter space
and single field inflation, although the formalism only relies on the
diffeomorphism invariance of the theory, and thus applies to any theory of
gravity.
