Approximate theories of the Raman non-coincidence effect are examined on the basis of the results of Monte Carlo simulations. Special emphasis is laid upon the treatments of liquid structures incorporated in those theories. The concept of “screening of two-body electrostatic interactions”, which is involved in one theory of the Raman non-coincidence effect, is shown to be inadequate in view of the calculated pair distribution functions. However, the mean spherical approximation, on which another theory of the Raman non-coincidence effect is based, properly describes the local order in the liquid giving rise to that effect, although ambiguities in estimating the effective hard sphere diameter cannot be avoided.