Natural explanation for discrete R-symmetry in successful inflation in N=1 supergravity

Recently it was shown that discrete R-invariance in superpotential can lead to a successful flat potential in inflation. We suggest that this discrete R-symmetry arises from an underlying supersymmetric gauge theory, which gives rise to a scalar inflaton as a composite field. This discrete R-symmetry is common to the dynamical breaking scenarios in global supersymmetry studied several years ago. Some extension of the R-invariance method is also shown.