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We demonstrate that supergravity models containing the Standard Model,dilaton and modulus naturally lead to dynamical symmetry breaking withexcellent phenomenology. We assume primordial supersymmetry breaking in theform of a constant contribution to the superpotential. String inspiredrelations link fundamental couplings to the dilaton vev. We specialize to aclass of models inspired by the $4$-$D$ fermionic string. Non-renormalizableterms in the superpotential naturally produce the Higgs mixing parameter $\mu$suitable for our mechanism. We discuss extensions and limitations of ourapproach.Comment: 8 page plain TeX file with 3 figures in a tarred, compressed,  uuencoded ps fil

Dynamical Determination of the Fundamental Couplings in Supergravity Models