An exact Radon-Nikodym
theorem is obtained for finitely additive bounded scalar measures defined on a field,
the additional condition being a local condition on the dominant average range. The
traditional technique of transferring the problem to the Stone space, which results in
approximate Radon-Nikodym derivatives, is circumvented by isolating an Exhaustion
principal for finitely additive measures which is then utilized to obtain the necessary
decompositions.