We show that all the nonrenormalizable terms in the effective superpotential for any Abelian symmetric orbifold with at least (0,2) world-sheet supersymmetry as well as any blown-up (2,2) orbifold are exponentially suppressed by the size R of the compactified space, i.e., {∝}exp(-R²/{α}').
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Mirjam Cveti (1987) studied this question.