  The origin of quark-hadron Duality Violations (DVs) can be related to the
sigularities of the Laplace transform of the spectral function. With the help
of rather generic properties of the large-$N_c$ approximation and a generalized
form for the radial trajectories found in Regge Theory, we may locate these
singularities in the complex plane and obtain an expression for the DVs which
turns out to agree with general expectations. Using the two-point vector
correlator as a test laboratory, we show how the usual dispersion relation may
give rise to perturbation theory, the power corrections from the condensate
expansion and DVs.
